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Journal articles on the topic 'Bose-Einstein condensation. Superfluidity'

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Published: 4 June 2021
Last updated: 3 February 2022

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1

Bunkov, Yuriy M. "Spin superfluidity and magnons Bose–Einstein condensation." Physics-Uspekhi 53, no. 8 (November 15, 2010): 848–53. http://dx.doi.org/10.3367/ufne.0180.201008m.0884.

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2

Bunkov, Yu M. "Spin superfluidity and magnons Bose - Einstein condensation." Uspekhi Fizicheskih Nauk 180, no. 8 (2010): 884. http://dx.doi.org/10.3367/ufnr.0180.201008m.0884.

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3

Bunkov, Yuriy M., and Grigory E. Volovik. "Magnon Bose–Einstein condensation and spin superfluidity." Journal of Physics: Condensed Matter 22, no. 16 (March 30, 2010): 164210. http://dx.doi.org/10.1088/0953-8984/22/16/164210.

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4

Kobayashi, Michikazu, and Makoto Tsubota. "Bose–Einstein condensation and superfluidity of dirty Bose gas." Physica B: Condensed Matter 329-333 (May 2003): 212–13. http://dx.doi.org/10.1016/s0921-4526(02)01962-2.

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5

Stringari, Sandro. "Bose–Einstein condensation and superfluidity in trapped atomic gases." Comptes Rendus de l'Académie des Sciences - Series IV - Physics 2, no. 3 (April 2001): 381–97. http://dx.doi.org/10.1016/s1296-2147(01)01178-7.

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6

Fortin, E., and A. Mysyrowicz. "Bose–Einstein condensation and superfluidity of excitons in Cu2O." Journal of Luminescence 87-89 (May 2000): 12–14. http://dx.doi.org/10.1016/s0022-2313(99)00206-9.

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7

Chela-Flores, J., and H. B. Ghassib. "Solitons, Bose-Einstein condensation, and superfluidity in helium II." International Journal of Theoretical Physics 26, no. 11 (November 1987): 1039–49. http://dx.doi.org/10.1007/bf00669359.

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8

Nozières, P. "Superfluidity and Bose Einstein Condensation Yesterday, Today and Tomorrow." Journal of Low Temperature Physics 162, no. 3-4 (December 22, 2010): 89–95. http://dx.doi.org/10.1007/s10909-010-0335-8.

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9

Boudjemâa, Abdelâali. "Superfluidity and Bose–Einstein Condensation in a Dipolar Bose Gas with Weak Disorder." Journal of Low Temperature Physics 180, no. 5-6 (June 10, 2015): 377–93. http://dx.doi.org/10.1007/s10909-015-1312-z.

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10

SILVERMAN, M. P. "FERMION CONDENSATION IN A RELATIVISTIC DEGENERATE STAR: ARRESTED COLLAPSE AND MACROSCOPIC EQUILIBRIUM." International Journal of Modern Physics D 15, no. 12 (December 2006): 2257–65. http://dx.doi.org/10.1142/s0218271806009522.

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Fermionic Cooper pairing leading to the BCS-type hadronic superfluidity is believed to account for periodic variations ("glitches") and subsequent slow relaxation in spin rates of neutron stars. Under appropriate conditions, however, fermions can also form a Bose–Einstein condensate of composite bosons. Both types of behavior have recently been observed in tabletop experiments with ultra-cold fermionic atomic gases. Since the behavior is universal (i.e., independent of atomic potential) when the modulus of the scattering length greatly exceeds the separation between particles, one can expect analogous processes to occur within the supradense matter of neutron stars. In this paper, I show how neutron condensation to a Bose–Einstein condensate, in conjunction with relativistically exact expressions for fermion energy and degeneracy pressure and the relations for thermodynamic equilibrium in a spherically symmetric space–time with Schwarzschild metric, leads to stable macroscopic equilibrium states of stars of finite density, irrespective of mass.
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11

Kobayashi, Michikazu, and Makoto Tsubota. "Bose-Einstein Condensation and Superfluidity of Strongly Correlated Bose Fluid in a Random Potential." Journal of Low Temperature Physics 138, no. 1-2 (January 2005): 189–94. http://dx.doi.org/10.1007/s10909-005-1549-z.

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12

Sun, Chen, Thomas Nattermann, and Valery L. Pokrovsky. "Bose–Einstein condensation and superfluidity of magnons in yttrium iron garnet films." Journal of Physics D: Applied Physics 50, no. 14 (March 7, 2017): 143002. http://dx.doi.org/10.1088/1361-6463/aa5cfc.

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13

de LLANO, M., F. J. SEVILLA, and S. TAPIA. "COOPER PAIRS AS BOSONS." International Journal of Modern Physics B 20, no. 20 (August 10, 2006): 2931–39. http://dx.doi.org/10.1142/s0217979206034947.

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Although BCS pairs of fermions are known to obey neither Bose–Einstein (BE) commutation relations nor BE statistics, we show how Cooper pairs (CPs), whether the simple original ones or the CPs recently generalized in a many-body Bethe–Salpeter approach, being clearly distinct from BCS pairs at least obey BE statistics. Hence, contrary to widespread popular belief, CPs can undergo BE condensation to account for superconductivity if charged, as well as for neutral-atom fermion superfluidity where CPs, but uncharged, are also expected to form.
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14

ALBERGAMO, FRANCESCO. "EXCITATIONS IN CONFINED LIQUID 4He." Modern Physics Letters B 19, no. 04 (February 28, 2005): 135–56. http://dx.doi.org/10.1142/s0217984905008189.

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The spectacular properties of liquid helium at low temperature are generally accepted as the signature of the bosonic nature of this system. Particularly the superfluid phase is identified with a Bose–Einstein condensed fluid. However, the relationship between the superfluidity and the Bose–Einstein condensation is still largely unknown. Studying a perturbed liquid 4 He system would provide information on the relationship between the two phenomena. Liquid 4 He confined in porous media provides an excellent example of a boson system submitted to disorder and finite-size effects. Much care should be paid to the sample preparation, particularly the confining condition should be defined quantitatively. To achieve homogeneous confinement conditions, firstly a suitable porous sample should be selected, the experiments should then be conducted at a lower pressure than the saturated vapor pressure of bulk helium. Several interesting effects have been shown in confined 4 He samples prepared as described above. Particularly we report the observation of the separation of the superfluid-normal fluid transition temperature, T c , from the temperature at which the Bose–Einstein condensation is believed to start, T BEC , the existence of metastable densities for the confined liquid accessible to the bulk system as a short-lived metastable state only and strong clues for a finite lifetime of the elementary excitations at temperatures as low as 0.4 K .
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15

OHASHI, YOJI. "BCS-BEC CROSSOVER IN A SUPERFLUID FERMI GAS." International Journal of Modern Physics B 20, no. 30n31 (December 20, 2006): 5204–13. http://dx.doi.org/10.1142/s0217979206036272.

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We discuss the superfluid phase transition in a gas of Fermi atoms with a Feshbach resonance. A tunable pairing interaction associated with the Feshbach resonance is shown to naturally lead to the BCS-BEC crossover, where the character of superfluidity continuously changes from the weak-coupling Bardeen-Cooper-Schrieffer (BCS) type to the Bose-Einstein condensation (BEC) of tightly bound molecules, as one decreases the threshold energy 2ν of the Feshbach resonance. We also discuss effects of a trap, as well as the p-wave BCS-BEC crossover adjusted by a p-wave Feshbach resonance.
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16

KETTERLE, WOLFGANG. "NEW FORMS OF QUANTUM MATTER NEAR ABSOLUTE ZERO TEMPERATURE." International Journal of Modern Physics D 16, no. 12b (December 2007): 2413–19. http://dx.doi.org/10.1142/s0218271807011462.

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In my talk at the workshop on fundamental physics in space I described the nanokelvin revolution which has taken place in atomic physics. Nanokelvin temperatures have given us access to new physical phenomena including Bose–Einstein condensation, quantum reflection, and fermionic superfluidity in a gas. They also enabled new techniques of preparing and manipulating cold atoms. At low temperatures, only very weak forces are needed to control the motion of atoms. This gave rise to the development of miniaturized setups including atom chips. In Earth-based experiments, gravitational forces are dominant unless they are compensated by optical and magnetic forces. The following text describes the work which I used to illustrate the nanokelvin revolution in atomic physics. Strongest emphasis is given to superfluidity in fermionic atoms. This is a prime example of how ultracold atoms are used to create well-controlled strongly interacting systems and obtain new insight into many-body physics.
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17

Berman, Oleg L., Roman Ya Kezerashvili, and Yurii E. Lozovik. "On Bose–Einstein condensation and superfluidity of trapped photons with coordinate-dependent mass and interactions." Journal of the Optical Society of America B 34, no. 8 (July 21, 2017): 1649. http://dx.doi.org/10.1364/josab.34.001649.

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18

Berman, Oleg L., Roman Ya Kezerashvili, Yurii E. Lozovik, and David W. Snoke. "Bose–Einstein condensation and superfluidity of trapped polaritons in graphene and quantum wells embedded in a microcavity." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1932 (December 13, 2010): 5459–82. http://dx.doi.org/10.1098/rsta.2010.0208.

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The theory for spontaneous coherence of short-lived quasiparticles in two-dimensional excitonic systems is reviewed, in particular, quantum wells (QWs) and graphene layers (GLs) embedded in microcavities. Experiments with polaritons in an optical microcavity have already shown evidence of Bose–Einstein condensation (BEC) in the lowest quantum state in a harmonic trap. The theory of BEC and superfluidity of the microcavity excitonic polaritons in a harmonic potential trap is presented. Along the way, we determine a general method for defining the superfluid fraction in a two-dimensional trap, within the angular momentum representation. We discuss BEC of magnetoexcitonic polaritons (magnetopolaritons) in a QW and GL embedded in an optical microcavity in high magnetic field. It is shown that Rabi splitting in graphene is tunable by the external magnetic field B , while in a QW the Rabi splitting does not depend on the magnetic field in the strong B limit.
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19

Vetoshko, P. M., G. A. Knyazev, A. N. Kuzmichev, A. A. Kholin, V. I. Belotelov, and Yu M. Bunkov. "Bose—Einstein Condensation and Spin Superfluidity of Magnons in a Perpendicularly Magnetized Yttrium Iron Garnet Film." JETP Letters 112, no. 5 (September 2020): 299–304. http://dx.doi.org/10.1134/s0021364020170105.

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20

MARQUES, G. C. "MICROSCOPIC MODEL OF SUPERFLUID HELIUM-4." International Journal of Modern Physics B 08, no. 11n12 (May 30, 1994): 1577–624. http://dx.doi.org/10.1142/s0217979294000683.

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To understand the properties of superfluid Helium-4 we propose a microscopic model for the description of this imperfect boson gas at very low temperatures. This microscopic theory contains only two parameters that are inferred from the He-He interaction potential. The understanding of the properties of Helium-4 in the super-fluid phase is based on Bose-Einstein condensation and for its description we use field theory at finite temperatures. We get a large number of characteristic features of superfluidity. Among these features we get phonon and roton spectrum, the two-fluid component description and London’s relation. We have also made predictions for twelve physically relevant quantities for He-4 below the λ-point. The predictions of the model were made by using the loop expansion in field theory. We find that our predictions are in reasonable agreement with the experimental results.
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21

Tanzini, A., and S. P. Sorella. "Bose–Einstein condensation and superfluidity of a weakly-interacting photon gas in a nonlinear Fabry–Perot cavity." Physics Letters A 263, no. 1-2 (November 1999): 43–47. http://dx.doi.org/10.1016/s0375-9601(99)00716-1.

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22

Vilchynskyy, S. I., A. I. Yakimenko, K. O. Isaieva, and A. V. Chumachenko. "The nature of superfluidity and Bose-Einstein condensation: From liquid4He to dilute ultracold atomic gases (Review Article)." Low Temperature Physics 39, no. 9 (September 2013): 724–40. http://dx.doi.org/10.1063/1.4821075.

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23

Bedell, Kevin S., Isaac F. Silvera, and Neil S. Sullivan. "Spin-Polarized Quantum Fluids and Solids." MRS Bulletin 18, no. 8 (August 1993): 38–43. http://dx.doi.org/10.1557/s0883769400037751.

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The spin-polarized phases of the quantum fluids and solids, liquid 3He, solid 3He, and spin-aligned hydrogen have generated considerable excitement over the past fifteen years. The introduction of high magnetic fields (B ∼ 10–30 T) in conjunction with low temperatures (T ≲ 100 mK) has given rise to opportunities for exploring some of the new phases predicted for these materials. There is a broad range of physical phenomena that can be accessed in this regime of parameter space—unconventional superfluidity, unusual magnetic ordering, Bose-Einstein condensation and Kosterlitz-Thouless transitions, to name a few. This is most surprising since this plethora of complicated states of matter are present in some of the most uncomplicated materials. The rich variety of phases found in these materials are all examples of collective phenomena of quantum many-body systems, and they serve as prototypes for developing an understanding of magnetism and order/disorder processes in other systems, and for the design and characterization of new materials.
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24

Khan, Yasir. "Novel solitary wave solution of the nonlinear fractal Schrödinger equation and its fractal variational principle." Multidiscipline Modeling in Materials and Structures 17, no. 3 (March 1, 2021): 630–35. http://dx.doi.org/10.1108/mmms-08-2020-0202.

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PurposeThe nonlinear Schrödinger equation plays a vital role in wave mechanics and nonlinear optics. The purpose of this paper is the fractal paradigm of the nonlinear Schrödinger equation for the calculation of novel solitary solutions through the variational principle.Design/methodology/approachAppropriate traveling wave transform is used to convert a partial differential equation into a dimensionless nonlinear ordinary differential equation that is handled by a semi-inverse variational technique.FindingsThis paper sets out the Schrödinger equation fractal model and its variational principle. The results of the solitary solutions have shown that the proposed approach is very accurate and effective and is almost suitable for use in such problems.Practical implicationsNonlinear Schrödinger equation is an important application of a variety of various situations in nonlinear science and physics, such as photonics, the theory of superfluidity, quantum gravity, quantum mechanics, plasma physics, neutron diffraction, nonlinear optics, fiber-optic communication, capillary fluids, Bose–Einstein condensation, magma transport and open quantum systems.Originality/valueThe variational principle of the Schrödinger equation without the Lagrange multiplier method in the sense of the fractal calculus is developed for the first time in the literature to the best of the author's understanding.
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25

KALLIO, A., J. HISSA, T. HÄYRYNEN, V. BRÄYSY, and T. SÄKKINEN. "CHEMICAL EQUILIBRIUM MODEL FOR HIGH-TC AND HEAVY FERMION SUPERCONDUCTORS: THE DENSITY OF STATES." International Journal of Modern Physics B 13, no. 05n06 (March 10, 1999): 651–57. http://dx.doi.org/10.1142/s0217979299000540.

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The chemical equilibrium model is based on the idea of correlated electron pairs, which in singlet state can exist as quasimolecules in the superfluid and normal states of a superconductor. These preformed pairs are bosons which can undergo a Bose-Einstein condensation in analogy with the superfluidity of 4 He+ 3 He -mixture. The bosons (B++) and the fermions (h+) are in chemical equilibrium with respect to the reaction B++⇌ 2 h+, at any temperature. The mean densities of bosons and fermions (quasiholes) nB(T) and nh(T) are determined from the thermodynamics of the equilibrium reaction in terms of a single function f(T). By thermodynamics the function f(T) is connected to equilibrium constant φ (T) by 1-f(T)= [1+φ(T)]-1/2. Using a simple power law, known to be valid near T=0, for the chemical constant φ(T)=α/t2γ, t=T/T*, the mean density of quasiholes is given in closed form. This enables one to calculate the corresponding density of states (DOS) D(E)=NS/N(0), by solving an integral equation. The NIS-tunneling conductivity near T=0, given by D(E) compares well with the most recent experiments: D(E)~ Eγ, for small E and a finite maximum of right size, corresponding to "finite quasiparticle lifetime". The corresponding SIS-tunneling conductivity is obtained from a simple convolution and is also in agreement with recent break junction experiments of Hancotte et al. The position of the maximum can be used to obtain the scaling temperature T*, which comes close to the one measured by Hall coefficient in the normal state. A simple explanation for the spingap effect in NMR is given.
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26

Astrakharchik, G. E., J. Boronat, J. Casulleras, and S. Giorgini. "Superfluidity versus Bose-Einstein condensation in a Bose gas with disorder." Physical Review A 66, no. 2 (August 9, 2002). http://dx.doi.org/10.1103/physreva.66.023603.

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27

Carusotto, Iacopo. "Sorting superfluidity from Bose-Einstein condensation in atomic gases." Physics 3 (January 19, 2010). http://dx.doi.org/10.1103/physics.3.5.

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28

Berman, Oleg L., Yurii E. Lozovik, and Godfrey Gumbs. "Bose-Einstein condensation and superfluidity of magnetoexcitons in bilayer graphene." Physical Review B 77, no. 15 (April 21, 2008). http://dx.doi.org/10.1103/physrevb.77.155433.

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29

Vranješ Markić, L., H. Vrcan, Z. Zuhrianda, and H. R. Glyde. "Superfluidity, Bose-Einstein condensation, and structure in one-dimensional Luttinger liquids." Physical Review B 97, no. 1 (January 19, 2018). http://dx.doi.org/10.1103/physrevb.97.014513.

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30

Kobayashi, Michikazu, and Makoto Tsubota. "Bose-Einstein condensation and superfluidity of a dilute Bose gas in a random potential." Physical Review B 66, no. 17 (November 18, 2002). http://dx.doi.org/10.1103/physrevb.66.174516.

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31

Mahmoud, Alyaa. "Superfluidity nature of a rotating Bose-Einstein condensation with finite size effect." Egyptian Journal of Physics, August 6, 2018, 0. http://dx.doi.org/10.21608/ejphysics.2018.3823.1005.

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32

Jain, Piyush, Fabio Cinti, and Massimo Boninsegni. "Structure, Bose-Einstein condensation, and superfluidity of two-dimensional confined dipolar assemblies." Physical Review B 84, no. 1 (July 29, 2011). http://dx.doi.org/10.1103/physrevb.84.014534.

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33

Berman, Oleg L., Godfrey Gumbs, and Roman Ya Kezerashvili. "Bose-Einstein condensation and superfluidity of dipolar excitons in a phosphorene double layer." Physical Review B 96, no. 1 (July 7, 2017). http://dx.doi.org/10.1103/physrevb.96.014505.

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34

Autti, S., V. V. Dmitriev, J. T. Mäkinen, J. Rysti, A. A. Soldatov, G. E. Volovik, A. N. Yudin, and V. B. Eltsov. "Bose-Einstein Condensation of Magnons and Spin Superfluidity in the Polar Phase of He3." Physical Review Letters 121, no. 2 (July 12, 2018). http://dx.doi.org/10.1103/physrevlett.121.025303.

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35

Conti, Sara, Samira Saberi-Pouya, Andrea Perali, Michele Virgilio, François M. Peeters, Alexander R. Hamilton, Giordano Scappucci, and David Neilson. "Electron–hole superfluidity in strained Si/Ge type II heterojunctions." npj Quantum Materials 6, no. 1 (April 23, 2021). http://dx.doi.org/10.1038/s41535-021-00344-3.

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AbstractExcitons are promising candidates for generating superfluidity and Bose–Einstein condensation (BEC) in solid-state devices, but an enabling material platform with in-built band structure advantages and scaling compatibility with industrial semiconductor technology is lacking. Here we predict that spatially indirect excitons in a lattice-matched strained Si/Ge bilayer embedded into a germanium-rich SiGe crystal would lead to observable mass-imbalanced electron–hole superfluidity and BEC. Holes would be confined in a compressively strained Ge quantum well and electrons in a lattice-matched tensile strained Si quantum well. We envision a device architecture that does not require an insulating barrier at the Si/Ge interface, since this interface offers a type II band alignment. Thus the electrons and holes can be kept very close but strictly separate, strengthening the electron–hole pairing attraction while preventing fast electron–hole recombination. The band alignment also allows a one-step procedure for making independent contacts to the electron and hole layers, overcoming a significant obstacle to device fabrication. We predict superfluidity at experimentally accessible temperatures of a few Kelvin and carrier densities up to ~6 × 1010 cm−2, while the large imbalance of the electron and hole effective masses can lead to exotic superfluid phases.
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36

Solnyshkov, D. D., H. Terças, K. Dini, and G. Malpuech. "Hybrid Boltzmann–Gross-Pitaevskii theory of Bose-Einstein condensation and superfluidity in open driven-dissipative systems." Physical Review A 89, no. 3 (March 20, 2014). http://dx.doi.org/10.1103/physreva.89.033626.

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37

Aoki, Koji, Kazuhiko Sakakibara, Ikuo Ichinose, and Tetsuo Matsui. "Magnetic order, Bose-Einstein condensation, and superfluidity in a bosonict−Jmodel ofCP1spinons and doped Higgs holons." Physical Review B 80, no. 14 (October 7, 2009). http://dx.doi.org/10.1103/physrevb.80.144510.

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38

Berman, Oleg L., Yurii E. Lozovik, and David W. Snoke. "Theory of Bose-Einstein condensation and superfluidity of two-dimensional polaritons in an in-plane harmonic potential." Physical Review B 77, no. 15 (April 16, 2008). http://dx.doi.org/10.1103/physrevb.77.155317.

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39

Shams, Ali A., and H. R. Glyde. "Superfluidity and Bose-Einstein condensation in optical lattices and porous media: A path integral Monte Carlo study." Physical Review B 79, no. 21 (June 8, 2009). http://dx.doi.org/10.1103/physrevb.79.214508.

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40

Milstein, J. N., S. J. J. M. F. Kokkelmans, and M. J. Holland. "Resonance theory of the crossover from Bardeen-Cooper-Schrieffer superfluidity to Bose-Einstein condensation in a dilute Fermi gas." Physical Review A 66, no. 4 (October 10, 2002). http://dx.doi.org/10.1103/physreva.66.043604.

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41

Ferreira, Elisa G. M. "Ultra-light dark matter." Astronomy and Astrophysics Review 29, no. 1 (September 9, 2021). http://dx.doi.org/10.1007/s00159-021-00135-6.

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AbstractUltra-light dark matter is a class of dark matter models (DM), where DM is composed by bosons with masses ranging from $$10^{-24}\, \mathrm {eV}< m < \mathrm {eV}$$ 10 - 24 eV < m < eV . These models have been receiving a lot of attention in the past few years given their interesting property of forming a Bose–Einstein condensate (BEC) or a superfluid on galactic scales. BEC and superfluidity are some of the most striking quantum mechanical phenomena that manifest on macroscopic scales, and upon condensation, the particles behave as a single coherent state, described by the wavefunction of the condensate. The idea is that condensation takes place inside galaxies while outside, on large scales, it recovers the successes of $$\varLambda $$ Λ CDM. This wave nature of DM on galactic scales that arise upon condensation can address some of the curiosities of the behaviour of DM on small-scales. There are many models in the literature that describe a DM component that condenses in galaxies. In this review, we are going to describe those models, and classify them into three classes, according to the different non-linear evolution and structures they form in galaxies: the fuzzy dark matter (FDM), the self-interacting fuzzy dark matter (SIFDM), and the DM superfluid. Each of these classes comprises many models, each presenting a similar phenomenology in galaxies. They also include some microscopic models like the axions and axion-like particles. To understand and describe this phenomenology in galaxies, we are going to review the phenomena of BEC and superfluidity that arise in condensed matter physics, and apply this knowledge to DM. We describe how ULDM can potentially reconcile the cold DM picture with the small-scale behaviour. These models present a rich phenomenology that is manifest in different astrophysical consequences. We review here the astrophysical and cosmological tests used to constrain those models, together with new and future observations that promise to test these models in different regimes. For the case of the FDM class, the mass where this model has an interesting phenomenology on small-scales $$ \sim 10^{-22}\, \mathrm {eV}$$ ∼ 10 - 22 eV , is strongly challenged by current observations. The parameter space for the other two classes remains weakly constrained. We finalize by showing some predictions that are a consequence of the wave nature of this component, like the creation of vortices and interference patterns, that could represent a smoking gun in the search of these rich and interesting alternative class of DM models.
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