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Journal articles on the topic 'Interaction spin phonon'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

PAUL, PRABASAJ, and DANIEL C. MATTIS. "EXTINCTION OF SPIN INTERACTIONS IN THE 2D KONDO LATTICE." International Journal of Modern Physics B 09, no. 24 (1995): 3199–208. http://dx.doi.org/10.1142/s0217979295001221.

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A two-dimensional Kondo lattice with inter-site interaction is studied using a canonical transformation to eliminate interactions. Our approach is patterned on Bardeen and Pines' elimination of electron–phonon interaction. It is shown that interactions are eliminated at nonzero temperatures in the thermodynamic limit, in a manner differing radically from the case of phonons.

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2

Yavorsky, Maxim, Dmitriy Vikulin, Constantine Alexeyev, and Vladimir Belotelov. "Photon–phonon spin–orbit interaction in optical fibers." Optica 8, no. 5 (2021): 638. http://dx.doi.org/10.1364/optica.416498.

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3

Loa, I., S. Gronemeyer, C. Thomsen, and R. K. Kremer. "Spin gap and spin-phonon interaction in CuGeO3." Solid State Communications 99, no. 4 (1996): 231–35. http://dx.doi.org/10.1016/0038-1098(96)00303-1.

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4

WESSELINOWA, J. M., and A. T. APOSTOLOV. "DYNAMICAL STRUCTURE FACTOR FOR s - f MODEL WITH SPIN-PHONON INTERACTION." International Journal of Modern Physics B 10, no. 22 (1996): 2797–809. http://dx.doi.org/10.1142/s0217979296001264.

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A Green's function technique is used to study the effects of spin–phonon interaction in ferromagnetic semiconductors based on the s - f model. The spin wave energy and the damping are evaluated for the first time beyond the RPA and numerically calculated. They increase with increasing spin–phonon interaction. The dependence of the dynamical structure factor on temperature and on spin–phonon interaction is discussed. At fixed T with increasing spin–phonon interaction the peak height decreases, the half-width increases, whereas the peak shifts to higher energy values.

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5

Apostolov, A. T., I. N. Apostolova, and J. M. Wesselinowa. "Influence of spin–phonon interactions and spin-reorientation transitions on the phonon properties of RCrO3." Modern Physics Letters B 31, no. 03 (2017): 1750009. http://dx.doi.org/10.1142/s0217984917500099.

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Using a microscopic model and a Green’s function technique we calculate the renormalized phonon energy in multiferroic RCrO3 (R = Sm, Dy, Er, Pr, Gd and Y) compounds as a function of temperature, magnetic field and R-ionic radius. We explain the observed anomalies in the temperature dependence of the phonon spectra based on a detailed analysis of the influence of the magnetic sublattices, the interaction between them and the spin-reorientation (SR) transition on lattice vibrations via spin–phonon interactions. When the rare earth ions are magnetic we investigate their essential role for the anomalies around the SR temperature. For the case when R is nonmagnetic, for example YCrO3, we propose a new microscopic model. We define an induced Dzyaloshinskii–Moriya (IDM) vector as a consequence from the spontaneous polarization. This IDM interaction is responsible for the appearance of a temperature-driven SR transition, which itself is responsible for the phonon anomalies at low temperatures. The numerical calculations are in good qualitative agreement with the experimental data.

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6

KOO, JE HUAN, and GUANGSUP CHO. "METALLIC FERROMAGNETISM DRIVEN BY PHONON-ENHANCED SPIN FLUCTUATIONS." International Journal of Modern Physics B 21, no. 06 (2007): 857–69. http://dx.doi.org/10.1142/s021797920703676x.

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We investigate the metallic ferromagnetism for materials with incomplete 3d-orbitals. The ferromagnetism occurs in electrons of s-orbitals by phonon-enhanced spin flippings of d-electrons via s-d exchange interactions, which was discussed by us [Phys. Rev. B61, 4289 (2000)]. We know the electron-electron interaction, U sd , mediated by phonon-enhanced spin flippings is repulsive for metallic ferromagnetic materials but attractive for high transition temperature superconductors (HTSC). The electron-electron interaction, U sd , is an order of magnitude stronger than that by Kondo-type bare spin-flippings. We elucidate non-occurrence of ferromagnetism in Pd even though it has very strong exchange interactions. We also show that the charge sum rule is recovered in the case of inclusion of U sd . We calculate the resistivity in normal states.

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7

Tartakovskaya, E. V., and B. A. Ivanov. "Spin-phonon interaction in thin magnetic films." Physica B: Condensed Matter 263-264 (March 1999): 769–71. http://dx.doi.org/10.1016/s0921-4526(98)01458-6.

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8

Cao, Xian-Sheng. "Anharmonic phonon properties in Eu0.5Ba0.5TiO3." Materials Science-Poland 36, no. 1 (2018): 141–44. http://dx.doi.org/10.1515/msp-2018-0003.

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Abstract Phonon properties have been studied using reduced sound velocity of Eu0.5Ba0.5TiO3 (EBTO). To achieve this aim, the anharmonic phonon-phonon interaction and the spin-phonon interaction were used. It was shown that the reduced sound velocity of multiferroic EBTO exhibits a kink at TN = 1.9 K. This anomalously reduced sound velocity can be interpreted as an effect of vanishing magnetic ordering above TN. What’s more, the ferroelectric subsystem cannot be influenced by the magnetic subsystem above TN for TN ≪TC in the EBTO. It was found that the reduced sound velocity decreases as T increases near ferroelectric transition TC. That is to say, the sound velocity softens near ferroelectric transition TC. It is also noteworthy that the reduced sound velocity softens when the RE (the coupling between the ferroelectric pseudo-spins and phonons), V(3) and |V(4)| (the third- and fourth-order atomic force constants of the anharmonic phonons, respectively) increase. These conclusions are all in good accordance with the experimental data and theoretical results.

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9

Chân, Nguy??ñ Ngoc. "Spin-Phonon Interaction beyond the Limit of Spin-wave Approximation." Annalen der Physik 500, no. 6 (1988): 404–8. http://dx.doi.org/10.1002/andp.19885000604.

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10

Seo, H., M. Kuwabara, and M. Ogata. "Co-existence of charge order and spin Peierls lattice distortion in one-dimensional organic compounds." Journal de Physique IV 12, no. 9 (2002): 205–9. http://dx.doi.org/10.1051/jp4:20020396.

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The ground state properties of the organic spin-Peierls compounds with one-dimensional quarter-filled band are investigated theoretically. In the strongly correlated regime, two insulating states compete to each other, which are the charge ordered state due to the inter-site Coulomb interaction, and the `dimer Mott' insulating state due to the combined effects of the electron-phonon and the on-site Coulomb interactions. In both of these states, the electron-phonon interaction further produces the lattice tetramization, which is interpreted as the spin-Peierls state.

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11

Lunghi, Alessandro, and Stefano Sanvito. "How do phonons relax molecular spins?" Science Advances 5, no. 9 (2019): eaax7163. http://dx.doi.org/10.1126/sciadv.aax7163.

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The coupling between electronic spins and lattice vibrations is fundamental for driving relaxation in magnetic materials. The debate over the nature of spin-phonon coupling dates back to the 1940s, but the role of spin-spin, spin-orbit, and hyperfine interactions has never been fully established. Here, we present a comprehensive study of the spin dynamics of a crystal of Vanadyl-based molecular qubits by means of first-order perturbation theory and first-principles calculations. We quantitatively determine the role of the Zeeman, hyperfine, and electronic spin dipolar interactions in the direct mechanism of spin relaxation. We show that, in a high magnetic field regime, the modulation of the Zeeman Hamiltonian by the intramolecular components of the acoustic phonons dominates the relaxation mechanism. In low fields, hyperfine coupling takes over, with the role of spin-spin dipolar interaction remaining the less important for the spin relaxation.

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12

Lyapilin, Igor, and Mikhail Okorokov. "THE INFLUENCE OF “INJECTED” AND “THERMAL” MAGNONS ON A SPIN WAVE CURRENT AND DRAG EFFECT IN HYBRID STRUCTURES." EPJ Web of Conferences 185 (2018): 01022. http://dx.doi.org/10.1051/epjconf/201818501022.

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The formation of the two: injected and thermally excited, different in energies magnon subsystems and the influence of its interaction with phonons and between on drag effect under spin Seebeck effect conditions in the magnetic insulator part of the metal/ferromagnetic insulator/metal structure is studied. The analysis of the macroscopic momentum balance equations of the systems of interest conducted for different ratios of the drift velocities of the magnon and phonon currents show that the injected magnons relaxation on the thermal ones is possible to be dominant over its relaxation on phonons. This interaction will be the defining in the forming of the temperature dependence of the spin-wave current under spin Seebeck effect conditions, and inelastic part of the magnon-magnon interaction is the dominant spin relaxation mechanism.

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13

Jeong, Seung Gyo, Soo Yeon Lim, Jiwoong Kim, Sungkyun Park, Hyeonsik Cheong, and Woo Seok Choi. "Spin–phonon coupling in epitaxial SrRuO3 heterostructures." Nanoscale 12, no. 26 (2020): 13926–32. http://dx.doi.org/10.1039/d0nr03282d.

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Polarization-dependent Raman spectroscopy reveal robust spin–phonon coupling in SrRuO<sub>3</sub> heterostructures. The tailored spin interaction in the SrRuO<sub>3</sub> heterostructures leads to the modification in phonon anomaly.

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14

Xin, Wei, Chao Han, and Eerdunchaolu. "Influence of magnetic field and Rashba spin–orbit coupling on strong-coupling magnetopolarons in quantum disks." International Journal of Modern Physics B 28, no. 27 (2014): 1450185. http://dx.doi.org/10.1142/s0217979214501859.

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On the basis of Lee–Low–Pines (LLP) unitary transformation, the influence of external magnetic field, Rashba spin–orbit coupling and quantum size effect on the ground-state interaction energy of strong-coupling magnetopolarons in quantum disks (QDs) is studied by using the Tokuda improved linear combine operator method. The results show that the ground-state interaction energy of magnetopolarons consists of four parts: the energy caused by the confinement potential of QDs, interaction energy between the electron and external magnetic field, electron and longitudinal-optical (LO) phonon interaction energy and additional term of Rashba effect originating from phonons. The electron–LO phonon interaction energy Ee- ph and additional term of Rashba effect are always negative; the absolute value |Ee- ph | increases with increasing transverse confinement strength ω0, cyclotron frequency of external magnetic field ωc and electron–LO phonon coupling strength α, but decreases with increasing the thickness of QDs L; the state properties of magnetopolarons are closely linked with the sign of the ground-state interaction energy of magnetopolarons E int and change of E int with ωc, ω0, α and L. In addition, the vibration frequency of magnetopolarons λ increases with increasing ωc, ω0 and α, but decreases with increasing L. For the ground state of magnetopolarons in QDs, the electron–LO phonon interaction plays a significant role, meanwhile, the influence of Rashba spin–orbit coupling effect cannot be ignored.

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15

Gallay, R., and J. J. van der Klink. "Spin-phonon interaction in small particles of MgO:Ni2+." Physical Review B 38, no. 5 (1988): 3443–48. http://dx.doi.org/10.1103/physrevb.38.3443.

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16

Lockwood, D. J. "Spin–phonon interaction and mode softening in NiF2." Low Temperature Physics 28, no. 7 (2002): 505–9. http://dx.doi.org/10.1063/1.1496657.

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17

Piotrowski, E., and J. Łuczka. "Simple Derivation of the Direct Spin-Phonon Interaction." physica status solidi (b) 136, no. 1 (1986): K27—K31. http://dx.doi.org/10.1002/pssb.2221360150.

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18

Kochelaev, B. I., A. M. Safina, A. Shengelaya, H. Keller, K. A. Müller, and K. Conder. "Three-Spin-Polarons and Their Elastic Interaction in Cuprates." Modern Physics Letters B 17, no. 10n12 (2003): 415–21. http://dx.doi.org/10.1142/s0217984903005433.

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Properties of quasiparticles in doped cuprates formed by an oxygen hole and two adjacent copper holes are investigated on the basis of the extended Hubbard model. The ground state energy, wave functions and the polaron-phonon coupling are calculated. We also analyzed the polaron-polaron interaction via the phonon field. It was found that this interaction is highly anisotropic and can explain the experimentally observed phase separation in the strongly underdoped LaSrCuO:Mn system.

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19

Apostolov, A. T., I. N. Apostolova, and J. M. Wesselinowa. "Size and doping dependence of the phonon properties of SnO2 nanoparticles." Modern Physics Letters B 32, no. 21 (2018): 1850250. http://dx.doi.org/10.1142/s0217984918502500.

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Using a microscopic model, taking into account the spin–phonon interactions and the Green’s function technique, we have studied the phonon properties of pure and ion-doped SnO2 nanoparticles (NPs). The phonon energy of SnO2 NPs decreases whereas the damping increases with decreasing particle size. Near the Curie temperature in the NPs, there appears an anomaly in the phonon energy [Formula: see text] and damping [Formula: see text]. The phonon properties are very sensitive to the anharmonic spin–phonon interaction R. They can increase or decrease for [Formula: see text] or [Formula: see text] with increasing of temperature, respectively. In dependence of the radius of the doping ions, the phonon energies [Formula: see text] could be reduced (Co, Fe, Sm, Nd) or enhanced (Cu). The phonon damping is always enhanced in the doped NPs. In summary, due to the size and temperature effects, we obtain changes in the phonon energy and damping in pure SnO2 NPs, whereas in ion-doped ones, the doping effects strengthen these properties.

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20

MARTIN, THIERRY, and DANIEL LOSS. "PHASE DIAGRAM FOR A LUTTINGER LIQUID COUPLED TO PHONONS IN ONE DIMENSION." International Journal of Modern Physics B 09, no. 04n05 (1995): 495–533. http://dx.doi.org/10.1142/s0217979295000185.

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We consider a one-dimensional system consisting of electrons with short-ranged repulsive interactions and coupled to small-momentum transfer acoustic phonons. The interacting electrons are bosonized and described in terms of a Luttinger liquid which allows us to calculate exactly the one- and two-electron Green function. For non-interacting electrons, the coupling to phonons alone induces a singularity at the Fermi surface which is analogous to that encountered for electrons with an instantaneous attractive interaction. The exponents which determine the presence of singlet/triplet superconducting pairing fluctuations, and spin/charge density wave fluctuations are strongly affected by the presence of the Wentzel-Bardeen singularity, resulting in the favoring of superconducting fluctuations. For the Hubbard model the equivalent of a phase diagram is established, as a function of: the electron-phonon coupling, the electron filling factor, and the on-site repulsion between electrons. The Wentzel-Bardeen singularity can be reached for arbitrary values of the electron-phonon coupling constant by varying the filling factor. This provides an effective mechanism to push the system from the antiferromagnetic into the metallic phase, and finally into the superconducting phase as the electron filling factor is increased towards half-filling.

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21

Acquarone, M., M. Cuoco, and C. Noce. "Spin and Charge Correlations in the Extended Hubbard-Holstein Model." International Journal of Modern Physics B 13, no. 09n10 (1999): 1183–88. http://dx.doi.org/10.1142/s0217979299001156.

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From the complete extended Hubbard-Holstein Hamiltonian we obtain a polaronic effective Hamiltonian by successive application of generalized displacement and squeezing transformations, with wavevector dependent characteristic parameters which make possible a phonon-induced long range interaction between charges, whose sign can change with the distance. As an application we consider the four-site chain, in which the bare electronic interactions are evaluated by model Wannier functions of gaussian shape. The ground states for different ranges of interactions are obtained by exact diagonalization of the effective Hamiltonian, followed by simultaneous and independent optimization of the displacement and squeezing parameters. We consider the behaviour of the static spin and charge correlation functions for the half-filled case, upon varying the shape of the Wannier functions for given electron-phonon coupling. Special attention is devoted to the influence of the phonon coupling on the presence of competing or coexisting charge- and spin-ordered states.

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22

Popova, M. N. "Spectroscopy ofRFe3(BO3)4multiferroics: phase transitions, spin-phonon interaction, coupled electron-phonon modes." EPJ Web of Conferences 132 (December 13, 2016): 01010. http://dx.doi.org/10.1051/epjconf/201713201010.

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23

Marn, F. P., and H. Suhl. "Spin-orbit coupling modulated by the electron-phonon interaction." Physical Review Letters 63, no. 4 (1989): 442–44. http://dx.doi.org/10.1103/physrevlett.63.442.

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24

Chishko, K. A., and A. S. Rybalko. "Spin–Spin and Spin–Phonon Interaction as a Nature of Microwave Absorption in He II." Journal of Low Temperature Physics 196, no. 1-2 (2019): 21–27. http://dx.doi.org/10.1007/s10909-019-02173-y.

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25

Yakut, H., E. Tabar, and G. Hoşgör. "Effects of the isoscalar and isovector interaction on the ground-state magnetic moments of odd-mass 137–145Ce nuclei." Canadian Journal of Physics 97, no. 11 (2019): 1187–90. http://dx.doi.org/10.1139/cjp-2018-0697.

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A systematic study of the magnetic properties of deformed odd-neutron 137–145Ce isotopes using the microscopic quasiparticle phonon nuclear model (QPNM) has been presented. The QPNM includes residual spin–spin interaction in both isoscalar and isovector channels. The analysis shows that in the isoscalar channel contributions to the magnetic moment coming from the neutron and proton systems practically cancel out each other. On the other hand, in the isovector channel, the coherent contribution coming from the quasiparticle–phonon interactions leads to a spin polarization (core polarization), which is important for determination of the quenched spin gyromagnetic factors (gs). The quenched spin gyromagnetic factors so called [Formula: see text] have been found to range from [Formula: see text] to [Formula: see text] in the odd-mass 137–145Ce isotopic chain, which is similar to its phenomenological value ([Formula: see text] between [Formula: see text] and [Formula: see text]). By taking into consideration the core polarization effects, the available experimental data are satisfactorily reproduced with an accuracy of 0.01μN–0.1μN.

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26

Vartanian, A. L., A. L. Asatryan, A. G. Stepanyan, K. A. Vardanyan, and A. A. Kirakosyan. "Effect of spin–orbit coupling on the hot-electron energy relaxation in nanowires." International Journal of Modern Physics B 34, no. 32 (2020): 2050322. http://dx.doi.org/10.1142/s0217979220503221.

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The energy relaxation of hot electrons is proposed based on the spin–orbit (SO) interaction of both Rashba and Dresselhaus types with the effect of hot phonons. A continuum theory of optical phonons in nanowires taking into account the influence of confinement is used to study the hot-electron energy relaxation. The energy relaxation due to both confined (CO) and interface (IO) optical phonon emission on nanowire radius, electrical field strength, parameters of SO couplings and electron temperature is calculated. For considered values of the nanowire radius as well as other system parameters, scattering by IO phonons prevails over scattering by CO phonons. The presence of an electric field leads to the decrease of power loss in transitions between states with the same spin quantum numbers. With the increase of the electric field strength, the influence of the Dresselhaus SO interaction on the energy relaxation rate decreases. The effect of SO interaction does not change the previously obtained increasing dependence of power loss on electron temperature. The sensitivity of energy relaxation to the electric field also through the Rashba parameter allows controlling the rate of energy by electric field.

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27

Pines, David. "Effective interactions, elementary excitations, and transport in the helium liquids." Canadian Journal of Physics 65, no. 11 (1987): 1357–67. http://dx.doi.org/10.1139/p87-215.

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Polarization potentials, the self-consistent fields that describe the primary consequences of the strong atom–atom interaction in the helium liquids, are developed for liquid 4He and 3He. Emphasis is placed on the common physical origin of the effective interactions in all helium liquids, and the hierarchy of physical effects (very short-range atomic correlations, zero-point motion, and the Pauli principle) that determine their strength is reviewed. An overview is then given of the application of polarization potential theory to experiment, including the phonon–maxon–roton spectra of 4He and 3He–4He mixtures, the phonon–maxon spectrum of normal and spin-polarized 3He, and the transport properties of superfluid 4He and of normal and spin-polarized 3He.

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28

Singh, Karan, Mohit K. Sharma, and K. Mukherjee. "Spin-phonon coupling and exchange interaction in Gd substituted YFe0.5Cr0.5O3." Journal of Magnetism and Magnetic Materials 447 (February 2018): 26–31. http://dx.doi.org/10.1016/j.jmmm.2017.09.042.

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29

Nunner, T. S., J. Schmalian, and K. H. Bennemann. "Influence of electron-phonon interaction on spin-fluctuation-induced superconductivity." Physical Review B 59, no. 13 (1999): 8859–68. http://dx.doi.org/10.1103/physrevb.59.8859.

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30

Chen, X. K., J. C. Irwin, and J. P. Franck. "Evidence for a strong spin-phonon interaction in cupric oxide." Physical Review B 52, no. 18 (1995): R13130—R13133. http://dx.doi.org/10.1103/physrevb.52.r13130.

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31

Lockwood, D. J., and M. G. Cottam. "The spin‐phonon interaction in FeF2and MnF2studied by Raman spectroscopy." Journal of Applied Physics 64, no. 10 (1988): 5876–78. http://dx.doi.org/10.1063/1.342186.

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32

Mitrović, B., and W. E. Pickett. "Effect of electron-phonon interaction on spin susceptibility inA15 compounds." Physical Review B 35, no. 7 (1987): 3415–24. http://dx.doi.org/10.1103/physrevb.35.3415.

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33

Tripathy, Sukanta Kumar, and Deepanjali Misra. "Spin polarization in GaAs LED, the effect of phonon interaction." Optik - International Journal for Light and Electron Optics 124, no. 17 (2013): 2709–12. http://dx.doi.org/10.1016/j.ijleo.2012.08.094.

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34

YARLAGADDA, SUDHAKAR. "MICROSCOPIC APPROACH TO ELECTRON–PHONON INTERACTION PHYSICS IN HALF-DOPED MANGANITES." International Journal of Modern Physics B 15, no. 27 (2001): 3529–37. http://dx.doi.org/10.1142/s0217979201007415.

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We present a microscopic picture of charge, orbital, and spin ordering in manganites at 50% doping by considering Jahn–Teller interaction. For spinless fermions, in two-dimensions and at 50% doping, we show that Jahn–Teller distortion and charge-orbital ordering occur simultaneously with the system in an essentially orbitally polarized state of dx2-y2 orbitals. Upon including spin degree of freedom, for small antiferromagnetic coupling, we obtain CE-type ordering.

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35

Chen, Zhanghui, and Lin-Wang Wang. "Role of initial magnetic disorder: A time-dependent ab initio study of ultrafast demagnetization mechanisms." Science Advances 5, no. 6 (2019): eaau8000. http://dx.doi.org/10.1126/sciadv.aau8000.

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Despite more than 20 years of development, the underlying physics of the laser-induced demagnetization process is still debated. We present a fast, real-time time-dependent density functional theory (rt-TDDFT) algorithm together with the phenomenological atomic Landau-Lifshitz-Gilbert model to investigate this problem. Our Hamiltonian considers noncollinear magnetic moment, spin-orbit coupling (SOC), electron-electron, electron-phonon, and electron-light interactions. The algorithm for time evolution achieves hundreds of times of speedup enabling calculation of large systems. Our simulations yield a demagnetization rate similar to experiments. We found that (i) the angular momentum flow from light to the system is not essential and the spin Zeeman effect is negligible. (ii) The phonon can play a role but is not essential. (iii) The initial spin disorder and the self-consistent update of the electron-electron interaction play dominant roles and enhance the demagnetization to the experimentally observed rate. The spin disorder connects the electronic structure theory with the phenomenological three-temperature model.

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36

Alcalde, A. M., C. L. Romano, and G. E. Marques. "Spin relaxation rates in quantum dots: Role of the phonon modulated spin–orbit interaction." Solid State Communications 148, no. 5-6 (2008): 255–58. http://dx.doi.org/10.1016/j.ssc.2008.08.002.

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37

Egami, T., B. V. Fine, D. Parshall, A. Subedi, and D. J. Singh. "Spin-Lattice Coupling and Superconductivity in Fe Pnictides." Advances in Condensed Matter Physics 2010 (2010): 1–7. http://dx.doi.org/10.1155/2010/164916.

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We consider strong spin-lattice and spin-phonon coupling in iron pnictides and discuss its implications on superconductivity. Strong magneto-volume effect in iron compounds has long been known as the Invar effect. Fe pnictides also exhibit this effect, reflected in particular on the dependence of the magnetic moment on the atomic volume of Fe defined by the positions of the nearest neighbor atoms. Through the phenomenological Landau theory, developed on the basis of the calculations by the density functional theory (DFT) and the experimental results, we quantify the strength of the spin-lattice interaction as it relates to the Stoner criterion for the onset of magnetism. We suggest that the coupling between electrons and phonons through the spin channel may be sufficiently strong to be an important part of the superconductivity mechanism in Fe pnictides.

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38

Kovachev, St, and J. M. Wesselinowa. "Impact of the spin–phonon interaction on the phonon properties of multiferroic hexagonal RMnO3thin films." Journal of Physics: Condensed Matter 22, no. 25 (2010): 255901. http://dx.doi.org/10.1088/0953-8984/22/25/255901.

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39

Kornich, Viktoriia, Christoph Kloeffel, and Daniel Loss. "Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots." Quantum 2 (May 28, 2018): 70. http://dx.doi.org/10.22331/q-2018-05-28-70.

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We study theoretically the phonon-induced relaxation and decoherence of spin states of two electrons in a lateral double quantum dot in a SiGe/Si/SiGe heterostructure. We consider two types of singlet-triplet spin qubits and calculate their relaxation and decoherence times, in particular as a function of level hybridization, temperature, magnetic field, spin orbit interaction, and detuning between the quantum dots, using Bloch-Redfield theory. We show that the magnetic field gradient, which is usually applied to operate the spin qubit, may reduce the relaxation time by more than an order of magnitude. Using this insight, we identify an optimal regime where the magnetic field gradient does not affect the relaxation time significantly, and we propose regimes of longest decay times. We take into account the effects of one-phonon and two-phonon processes and suggest how our theory can be tested experimentally. The spin lifetimes we find here for Si-based quantum dots are significantly longer than the ones reported for their GaAs counterparts.

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40

Hong, Fang-Yu, Jing-Li Fu, Yan Wu, and Zhi-Yan Zhu. "Electrical control of strong spin-phonon coupling in a carbon nanotube." Quantum Information and Computation 17, no. 1&2 (2017): 117–24. http://dx.doi.org/10.26421/qic17.1-2-7.

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We describe an approach to electrically control the strong interaction between a single electron spin and the vibrational motion of a suspended carbon nanotube resonator. The strength of the deflection-induced spin-phonon coupling is dependent on the wavefunction of the electron confined in a lateral carbon nanotube quantum dot. An electrical field along the nanotube shifts the effective center of the quantum dot, leading to the corresponding modification of the spin-phonon strength. Numerical simulations with experimentally reachable parameters show that high fidelity quantum state transfer between mechanical and spin qubits driven by electrical pulses is feasible. Our results form the basis for the fully electrical control of the coherent interconvertion between light and spin qubits and for manufacturing electrically driven quantum information processing systems.

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41

Matsuno, Shunichi, Hideki Ushio, Yuji Suwa, and Hiroshi Kamimura. "V. Mechanism of Superconductivity." International Journal of Modern Physics B 11, no. 32 (1997): 3815–31. http://dx.doi.org/10.1142/s0217979297001957.

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A possibility of phonon-mediated interaction as a mechanism of high- T c superconductivity is discussed. Because of different spatial distribution of Bloch wave function for up-spin particle and down-spin particle in the present model, the effective pair interaction which is derived from electron–phonon interaction is shown to have significant momentum- transfer dependence that is quite different from ordinary phonon-mediated interaction. This characteristic of pair interaction together with the geometric feature of Fermi-surface derived in a previous paper III leads to a dx2-y2 symmetric gap state which is consistent with experimental results. Since d-wave state has much smaller Coulomb repulsion term than s-wave state, strong electron-phonon coupling in the present model is expected to cause the occurrence of high-temperature superconductivity. However, in the present model, it is shown that a factor that reduces superconducting transition temperature appear as a result of a fluctuation effect of antiferromagnetic (AF) order of localized Cu spins. The factor λs which should be proportional to AF correlation length λ AF , determines the time scale τs which eliminates the contribution from the retarded effective pair interaction of time argument larger than τs. Existence of length scale λs explains why T c goes to zero as increasing hole carrier to some extent, and why non-magnetic impurity such as Pb reduces T c strongly. λs also explains the finite density of zero-gap states observed in overdoped regime or samples with non-magnetic impurities.

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42

YAKUT, HAKAN, EMRE TABAR, ALI AKBAR KULIEV, ZEMINE ZENGINERLER, and PINAR KAPLAN. "GROUND STATE MAGNETIC PROPERTIES OF ODD NEUTRON DY ISOTOPES." International Journal of Modern Physics E 22, no. 10 (2013): 1350076. http://dx.doi.org/10.1142/s0218301313500766.

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Using the quasiparticle phonon nuclear model (QPNM) and taking into account the spin–spin interaction, the effects of the spin polarization on spin gyromagnetic factors (gs) as well as the intrinsic magnetic moments (gK) of the deformed odd neutron155-165Dy isotopes were studied. The calculated values of gsand gKare in fair agreement with the experiment as well as with other microscopic calculations. Our calculations indicated that because of the core polarization, the gsfactors of the nucleons in the nucleus reduce noticeably from its free nucleon value and the spin–spin interactions play an important role in the explanation of the quenching of the gsfactors. A very good reproduction of the phenomenological quenching of gsfactor from its free values [Formula: see text] is obtained for155-165Dy .

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Yasuda, Chitoshi, and Satoru Akiyama. "Quantum Phase Transition Induced by Geometrical Changes in Spin–Phonon Interaction." Journal of the Physical Society of Japan 84, no. 1 (2015): 014705. http://dx.doi.org/10.7566/jpsj.84.014705.

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Tanaka, C. "ELECTRON PHONON INTERACTION VS. SPIN FLUCTUATION EFFECTS IN ITINERANT ELECTRON MAGNETISM." Le Journal de Physique Colloques 49, no. C8 (1988): C8–77—C8–78. http://dx.doi.org/10.1051/jphyscol:1988825.

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45

Cottam, M. G., and D. J. Lockwood. "Spin-phonon interaction in transition-metal difluoride antiferromagnets: Theory and experiment." Low Temperature Physics 45, no. 1 (2019): 78–91. http://dx.doi.org/10.1063/1.5082316.

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Chân, Nguyêñ Ngoc. "The shift of the curie temperature due to spin-phonon interaction." Czechoslovak Journal of Physics 40, no. 3 (1990): 341–44. http://dx.doi.org/10.1007/bf01597759.

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47

Wesselinowa, J. M., and A. T. Apostolov. "Spin-phonon interaction effects in pure and ion-doped NiO nanoparticles." physica status solidi (b) 248, no. 3 (2010): 755–59. http://dx.doi.org/10.1002/pssb.201046148.

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Vaughan, M. P., and J. M. Rorison. "Model expressions for the spin-orbit interaction and phonon-mediated spin dynamics in quantum dots." Semiconductor Science and Technology 33, no. 1 (2017): 014001. http://dx.doi.org/10.1088/1361-6641/aa995d.

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49

Alcalde, A. M., O. O. Diniz Neto, and G. E. Marques. "Spin relaxation due to the phonon modulation of the spin–orbit interaction in quantum dots." Microelectronics Journal 36, no. 3-6 (2005): 241–43. http://dx.doi.org/10.1016/j.mejo.2005.02.014.

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Zhang, De-Lin, Jie Zhu, Tao Qu, et al. "High-frequency magnetoacoustic resonance through strain-spin coupling in perpendicular magnetic multilayers." Science Advances 6, no. 38 (2020): eabb4607. http://dx.doi.org/10.1126/sciadv.abb4607.

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It is desirable to experimentally demonstrate an extremely high resonant frequency, assisted by strain-spin coupling, in technologically important perpendicular magnetic materials for device applications. Here, we directly observe the coupling of magnons and phonons in both time and frequency domains upon femtosecond laser excitation. This strain-spin coupling leads to a magnetoacoustic resonance in perpendicular magnetic [Co/Pd]n multilayers, reaching frequencies in the extremely high frequency (EHF) band, e.g., 60 GHz. We propose a theoretical model to explain the physical mechanism underlying the strain-spin interaction. Our model explains the amplitude increase of the magnetoacoustic resonance state with time and quantitatively predicts the composition of the combined strain-spin state near the resonance. We also detail its precise dependence on the magnetostriction. The results of this work offer a potential pathway to manipulating both the magnitude and timing of EHF and strongly coupled magnon-phonon excitations.

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