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Journal articles on the topic 'Charge excitations'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Dressel, M., N. Drichko, and S. Kaiser. "Collective charge-order excitations." Physica C: Superconductivity and its Applications 470 (December 2010): S589—S591. http://dx.doi.org/10.1016/j.physc.2009.10.116.

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2

Sagawa, Hiroyuki. "Single and Double Charge Exchange Excitations of Spin-Isospin Mode." EPJ Web of Conferences 223 (2019): 01053. http://dx.doi.org/10.1051/epjconf/201922301053.

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We study the sum rules of double Gamow-Teller (DGT) excitations through double spin-isospin operator (σt)2 In general, 2+states in the granddaughter nuclei have dominant transition strength in DGT excitations and 0+states are weak, except in T = 1 mother nuclei in which 0+strength is competitive with 2+strength. A possibility to extract the unit cross section for the DGT transition strength is pointed out in the (#x03C3;t)2 excitation of double isobaric analog state (DIAS) in T = 1 nuclei.

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3

Freeman, P. G., S. M. Hayden, C. D. Frost, D. Prabhakaran, and A. T. Boothroyd. "Magnetic excitations of charge-ordered." Journal of Magnetism and Magnetic Materials 310, no. 2 (2007): 760–62. http://dx.doi.org/10.1016/j.jmmm.2006.10.488.

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4

Thalmeier, P., and A. N. Yaresko. "Magnetic excitations in charge ordered." European Physical Journal B 14, no. 3 (2000): 495. http://dx.doi.org/10.1007/s100510051058.

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5

Thalmeier, P., and A. N. Yaresko. "Magnetic excitations in charge ordered." European Physical Journal B 14, no. 3 (2000): 495–508. http://dx.doi.org/10.1007/pl00011054.

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6

Malcioglu, Baris, and Onur Pusuluk. "(Digital Presentation) Using Quantum Information Theory to Quantitatively Distinguish between Resonant Energy Transfer and Charge Transfer Interactions in Porphyrin Crystals." ECS Meeting Abstracts MA2024-01, no. 14 (2024): 1163. http://dx.doi.org/10.1149/ma2024-01141163mtgabs.

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Quantum discord is a concept in quantum information theory that measures the quantum correlations between two subsystems in a system. Unlike traditional measures of quantum entanglement, quantum discord captures all types of quantum correlations, including those that do not necessarily involve entanglement. It quantifies the information that is lost when measuring one subsystem. The GW formalism is a powerful theoretical framework for calculating electronic excitation energies and quasiparticle properties in condensed matter systems. The GW formalism can be used to calculate a variety of elect

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7

Moore, Barry, Haitao Sun, Niranjan Govind, Karol Kowalski, and Jochen Autschbach. "Charge-Transfer Versus Charge-Transfer-Like Excitations Revisited." Journal of Chemical Theory and Computation 11, no. 7 (2015): 3305–20. http://dx.doi.org/10.1021/acs.jctc.5b00335.

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8

Senaratne, Ruwan, Danyel Cavazos-Cavazos, Sheng Wang, et al. "Spin-charge separation in a one-dimensional Fermi gas with tunable interactions." Science 376, no. 6599 (2022): 1305–8. http://dx.doi.org/10.1126/science.abn1719.

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Ultracold atoms confined to periodic potentials have proven to be a powerful tool for quantum simulation of complex many-body systems. We confine fermions to one dimension to realize the Tomonaga-Luttinger liquid model, which describes the highly collective nature of their low-energy excitations. We use Bragg spectroscopy to directly excite either the spin or charge waves for various strengths of repulsive interaction. We observe that the velocity of the spin and charge excitations shift in opposite directions with increasing interaction, a hallmark of spin-charge separation. The excitation sp

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9

Mijoule, Claude, Jean-Marie Leclercq, Michel Comeau, Sándor Fliszár, and Maud Picard. "Charge distributions and chemical effects. XLVII. Density matrix contribution to the charge distribution in hydrocarbons, arising from singly excited configurations in CI calculations." Canadian Journal of Chemistry 70, no. 1 (1992): 68–73. http://dx.doi.org/10.1139/v92-013.

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The involvement of excited configurations in Mulliken charge analyses is examined for ethylene and acetylene, using an optimized 4-31G basis. The net charges of carbon, −346.4 × 10−3 (C2H4) and −335.3 × 10−3 e (C2H2) at the SCF level, are reduced to −269.9 × 10−3 and −271.2 × 10−3 e, respectively. Double excitations appear to contribute little to these corrections. In acetylene, three single σ → σ* type excitations are responsible for ~83% of the charge correction whereas, as expected, the role of π → π* type excitations is small. Similarly, four σ → σ* configurations account for ~76% of the c

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10

Kushwaha, Manvir S. "Charge density excitations in semiconductor superlattices." Journal of Applied Physics 62, no. 5 (1987): 1895–901. http://dx.doi.org/10.1063/1.339577.

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11

Bakhshaei, Elaheh, and Alessandro Bombini. "Three-charge superstrata with internal excitations." Classical and Quantum Gravity 36, no. 5 (2019): 055001. http://dx.doi.org/10.1088/1361-6382/ab01bc.

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12

Björnsson, P., M. Rübhausen, J. Bäckström, et al. "Lattice and charge excitations inLa1−xSrxMnO3." Physical Review B 61, no. 2 (2000): 1193–97. http://dx.doi.org/10.1103/physrevb.61.1193.

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13

Hasan, M. Z., E. D. Isaacs, Z. X. Shen, and L. L. Miller. "Charge excitations in a quantum antiferromagnet." Physica C: Superconductivity and its Applications 364-365 (November 2001): 618–21. http://dx.doi.org/10.1016/s0921-4534(01)00864-4.

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14

Manousakis, Efstratios. "Collective charge excitations along cell membranes." Physics Letters A 342, no. 5-6 (2005): 443–47. http://dx.doi.org/10.1016/j.physleta.2005.05.087.

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15

Degiorgi, L., F. B. B. Anders, and G. Grüner. "Charge excitations in heavy electron metals." European Physical Journal B 19, no. 2 (2001): 167–70. http://dx.doi.org/10.1007/s100510170324.

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16

Yang, Bing, Cai-rong Zhang, Yu Wang, et al. "Theoretical study on organic photovoltaic heterojunction FTAZ/IDCIC." Chinese Journal of Chemical Physics 36, no. 2 (2023): 199. http://dx.doi.org/10.1063/1674-0068/cjcp2109160.

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Understanding organic photovoltaic (OPV) work principles and the materials’ optoelectronic properties is fundamental for developing novel heterojunction materials with the aim of improving power conversion efficiency (PCE) of organic solar cells. Here, in order to understand the PCE performance (&gt;13%) of OPV device composed of the non-fullerene acceptor fusing naphtho[1,2-b:5,6-b′]dithiophene with two thieno[3,2-b]thiophene (IDCIC) and the polymer donor fluorobenzotriazole (FTAZ), with the aid of extensive quantum chemistry calculations, we investigated the geometries, molecular orbital

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17

Prelovšek, P., and Z. Lenarčič. "Charge relaxation and recombination in photo-excited Mott insulators." International Journal of Modern Physics B 30, no. 13 (2016): 1642015. http://dx.doi.org/10.1142/s0217979216420157.

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Recent femtosecond pump-probe experiments on Mott insulators reveal charge recombination, which is in picosecond range, i.e., much faster than in clean bandgap semiconductors although excitation gaps in Mott insulators are even larger. The charge response in photo-excited insulators can be generally divided in femtosecond transient relaxation of charge excitations, which are holons and doublons, and a second slower, but still very fast, holon–doublon (HD) recombination. We present a theory of the recombination rate of the excited HD pairs, based on the two-dimensional (2D) model relevant for c

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18

Zhang, Weilu, Shangfei Wu, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda, and Girsh Blumberg. "Quadrupolar charge dynamics in the nonmagnetic FeSe1−xSx superconductors." Proceedings of the National Academy of Sciences 118, no. 20 (2021): e2020585118. http://dx.doi.org/10.1073/pnas.2020585118.

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We use polarization-resolved electronic Raman spectroscopy to study quadrupolar charge dynamics in a nonmagnetic FeSe1−xSx superconductor. We observe two types of long-wavelength XY symmetry excitations: 1) a low-energy quasi-elastic scattering peak (QEP) and 2) a broad electronic continuum with a maximum at 55 meV. Below the tetragonal-to-orthorhombic structural transition at TS(x), a pseudogap suppression with temperature dependence reminiscent of the nematic order parameter develops in the XY symmetry spectra of the electronic excitation continuum. The QEP exhibits critical enhancement upon

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19

Nagasaki, Keisuke, Yoshihisa Inoue, and Tadashi Mori. "Contrasting Behaviour of Exciplex Ensembles in the Diastereodifferentiating Paternò–Büchi Reaction of Chiral Cyanobenzoate with Naphthyl- and Phenylethenes on Direct or Charge-Transfer Excitation." Australian Journal of Chemistry 68, no. 11 (2015): 1693. http://dx.doi.org/10.1071/ch15404.

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The diastereodifferentiating Paternò–Büchi reaction of chiral cyanobenzoate with 1-(1-naphthyl)-1-phenylethene was compared with those with 1,1-diphenylethene on direct and charge-transfer excitations. By desymmetrization of the donor, four diastereomeric oxetane products were formed on photolysis in excellent combined yields. Increase in donor strength induced a stronger charge-transfer interaction both in ground and excited states. Thus, the difference in diastereoselectivities with two different excitation modes (i.e. direct versus charge-transfer) became less significant with a naphthyl de

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20

Teuber, S., T. Döppner, M. Schumacher, J. Tiggesbäumker, and K. H. Meiwes-Broer. "Excitation of Heavy Metal Clusters by Strong fs Laser Pulses." Australian Journal of Physics 52, no. 3 (1999): 555. http://dx.doi.org/10.1071/ph99046.

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The excitation of neutral platinum and lead clusters by intense femtosecond laser pulses is studied by time-of-flight spectroscopy. Clusters are completely destroyed when interacting in the high intensity region of the laser focus. Moreover, highly charged atomic ions with up to 20 charges are detected under special pulse conditions. The atomic ion distribution shows a pronounced dependence on the chosen pulse width, suggesting that multi-plasmon excitations are responsible for the high charge states measured. The Coulomb explosion of a metal sphere is simulated under tunneling ionisation cond

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21

Watanabe, Daiki, Kaori Sugii, Masaaki Shimozawa, et al. "Emergence of nontrivial magnetic excitations in a spin-liquid state of kagomé volborthite." Proceedings of the National Academy of Sciences 113, no. 31 (2016): 8653–57. http://dx.doi.org/10.1073/pnas.1524076113.

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When quantum fluctuations destroy underlying long-range ordered states, novel quantum states emerge. Spin-liquid (SL) states of frustrated quantum antiferromagnets, in which highly correlated spins fluctuate down to very low temperatures, are prominent examples of such quantum states. SL states often exhibit exotic physical properties, but the precise nature of the elementary excitations behind such phenomena remains entirely elusive. Here, we use thermal Hall measurements that can capture the unexplored property of the elementary excitations in SL states, and report the observation of anomalo

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22

Novoselov, Alexander, та Oleg Pavlovsky. "Critical charge in gapped graphene: The role of screening of the interaction potential by σ-orbitals". International Journal of Modern Physics B 31, № 09 (2017): 1750068. http://dx.doi.org/10.1142/s0217979217500680.

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Due to its unique structure, graphene provides a condensed-matter model of particle physics phenomena. One is the critical charge which is highly interested. The investigation of critical charge in gapped graphene is performed within single particle approach by means of Dirac equation integration. The screened Coulomb interaction between charged defect and graphene electron excitations is investigated. Two kinds of mass gap generation and various values of substrate dielectric permittivities are considered. It is shown that the critical charge phenomenon can be observed even with quite small c

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23

Luo, Suichu, John R. Dunlap, and David C. Joy. "Modulation electron energy loss spectroscopy and its application of quantitative analysis." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 454–55. http://dx.doi.org/10.1017/s0424820100148101.

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Electron energy loss spectroscopy (EELS) gives an inportant insight into the variety of excitations a sample may undergo when irradiated by an electron beam. The focus of this work was to simulate electronic excitations within the energy range from a few to several hundred eV. Our recently developed modulation scheme, combines both convolution and deconvolution techniques, to provide quantitative information about elementary inelastic scattering processes without knowledge of sample parameters such as thickness or optical constants.In the low energy loss region of the spectrum the primary exci

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24

Tohyama, Takami, and Kenji Tsutsui. "Spectral weight of resonant inelastic X-ray scattering in doped cuprates: Effect of core-hole lifetime." International Journal of Modern Physics B 32, no. 17 (2018): 1840017. http://dx.doi.org/10.1142/s0217979218400179.

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We examine the effect of core-hole lifetime on the spectral weight of resonant inelastic X-ray scattering (RIXS) in hole-doped cuprates. We calculate the spectral weight by using the exact diagonalization technique for a 4 × 4 doped Hubbard lattice and find that the spin-flip channel detecting single-magnon excitation is less sensitive to the core-hole lifetime while in the non-spin-flip channel the spectral weight is strongly dependent on the lifetime. In the latter, charge and two-magnon excitations predominately contribute to RIXS for short and long core-hole lifetimes, respectively. For a

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25

Ruipérez, Fernando, Zoila Barandiarán, and Luis Seijo. "Quantum chemical study of 4f -> 5d excitations of trivalent lanthanide ions in the cubic elpasolite Cs2NaYCl6. Ce3+ to Tb3+." Journal of Chemical Physics 123 (December 22, 2005): 244703. https://doi.org/10.1063/1.2137689.

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Wave-function-based <em>ab initio</em> calculations on the lowest states of the ⁠, and configurations of clusters (⁠ to Tb) embedded in the cubic elpasolite have been performed, in an attempt to contribute to a comprehensive understanding of the excitations of lanthanide ions in crystals. Reliable data are provided on the changes of bond lengths and breathing mode vibrational frequencies upon and excitations, as well as on minimum-to-minimum and vertical absorption and emission transitions, and on the Stokes shifts. The available experimental data are discussed and predictions are made. The st

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26

Loos, Pierre-François, Massimiliano Comin, Xavier Blase, and Denis Jacquemin. "Reference Energies for Intramolecular Charge-Transfer Excitations." Journal of Chemical Theory and Computation 17, no. 6 (2021): 3666–86. http://dx.doi.org/10.1021/acs.jctc.1c00226.

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27

Russell, F. Michael, and Juan F. R. Archilla. "Ballistic Charge Transport by Mobile Nonlinear Excitations." physica status solidi (RRL) – Rapid Research Letters 16, no. 3 (2021): 2100420. http://dx.doi.org/10.1002/pssr.202100420.

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28

Sokolov, V. I., V. A. Pustovarov, V. N. Churmanov, et al. "Low-energy charge transfer excitations in NiO." IOP Conference Series: Materials Science and Engineering 38 (August 20, 2012): 012007. http://dx.doi.org/10.1088/1757-899x/38/1/012007.

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29

Heldmann, K., W. G. Teich, and G. Mahler. "Charge-transfer excitations on a linear chain." Physical Review B 44, no. 8 (1991): 3829–34. http://dx.doi.org/10.1103/physrevb.44.3829.

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30

Soos, Z. G., R. H. Harding, and S. Ramasesha. "Charge-Transfer Excitations In Partly-Inoic Complexes." Molecular Crystals and Liquid Crystals 125, no. 1 (1985): 59–70. http://dx.doi.org/10.1080/00268948508080087.

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31

Lyons, K. B., P. E. Sulewski, P. A. Fleury, et al. "High-energy spin and charge excitations inLa2CuO4." Physical Review B 39, no. 13 (1989): 9693–96. http://dx.doi.org/10.1103/physrevb.39.9693.

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32

Wu, Sanfeng, Leslie M. Schoop, Inti Sodemann, Roderich Moessner, Robert J. Cava, and N. P. Ong. "Charge-neutral electronic excitations in quantum insulators." Nature 635, no. 8038 (2024): 301–10. http://dx.doi.org/10.1038/s41586-024-08091-8.

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33

Dobry, A., A. Greco, R. Migoni, and M. Stachiotti. "Nonlinear lattice excitations in charge-fluctuating systems." Physical Review B 47, no. 9 (1993): 5442–45. http://dx.doi.org/10.1103/physrevb.47.5442.

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34

Ivanov, D. A., and Patrick A. Lee. "Bipolaronic charge excitations int−Jtwo-leg ladders." Physical Review B 57, no. 4 (1998): 2118–26. http://dx.doi.org/10.1103/physrevb.57.2118.

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35

Dadachanji, Z., R. W. Godby, R. J. Needs, and P. B. Littlewood. "Charge-transfer excitations in the cuprate superconductors." Physical Review B 52, no. 22 (1995): 16204–7. http://dx.doi.org/10.1103/physrevb.52.16204.

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36

Jones, Keith, Nikita Kirnosov, Keeper L. Sharkey, and Ludwik Adamowicz. "Charge asymmetry and rovibrational excitations of HD+." Molecular Physics 114, no. 13 (2016): 2052–73. http://dx.doi.org/10.1080/00268976.2016.1177666.

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37

Vijayan, Jayadev, Pimonpan Sompet, Guillaume Salomon, et al. "Time-resolved observation of spin-charge deconfinement in fermionic Hubbard chains." Science 367, no. 6474 (2020): 186–89. http://dx.doi.org/10.1126/science.aay2354.

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Elementary particles carry several quantum numbers, such as charge and spin. However, in an ensemble of strongly interacting particles, the emerging degrees of freedom can fundamentally differ from those of the individual constituents. For example, one-dimensional systems are described by independent quasiparticles carrying either spin (spinon) or charge (holon). Here, we report on the dynamical deconfinement of spin and charge excitations in real space after the removal of a particle in Fermi-Hubbard chains of ultracold atoms. Using space- and time-resolved quantum gas microscopy, we tracked

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38

Li, Jiachen, Ye Jin, Neil Qiang Su, and Weitao Yang. "Combining localized orbital scaling correction and Bethe–Salpeter equation for accurate excitation energies." Journal of Chemical Physics 156, no. 15 (2022): 154101. http://dx.doi.org/10.1063/5.0087498.

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We applied localized orbital scaling correction (LOSC) in Bethe–Salpeter equation (BSE) to predict accurate excitation energies for molecules. LOSC systematically eliminates the delocalization error in the density functional approximation and is capable of approximating quasiparticle (QP) energies with accuracy similar to or better than GW Green’s function approach and with much less computational cost. The QP energies from LOSC, instead of commonly used G0 W0 and ev GW, are directly used in BSE. We show that the BSE/LOSC approach greatly outperforms the commonly used BSE/ G0 W0 approach for p

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39

Rana, Rakesh, D. S. Rana, K. R. Mavani, I. Kawayama, H. Murakami, and M. Tonouchi. "Charge density wave excitations in stripe-type charge ordered Pr0.5Sr0.5MnO3 manganite." Applied Physics Letters 101, no. 25 (2012): 252401. http://dx.doi.org/10.1063/1.4772474.

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40

Liu, Qing Liong, Shu Wei Wang, Li Lv, and Xiao Jing Wang. "Investigation of Photo-Induced C-H Bond Activating by CpRh(CO)₂ Complex Using Density Functional Theory." Advanced Materials Research 279 (July 2011): 170–73. http://dx.doi.org/10.4028/www.scientific.net/amr.279.170.

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The charge transfer and structural distortions that occurred in the complex CpRh(CO)2 upon excitation with an light irradiation were studied by density functional theory (DFT). The calculations showed that the electrons transferred from Cp to CO ligands with the transition of CpRh(CO)2 from ground state to the first excited state. Accompanying with this transfer process, CpM(CO)2 became distorted and the linear bond of M-CO became bent upon excitation. The second excitation is the strongest excitation which is identified to be metal to ligand CO charge transfer (MLCT) excitations. We also foun

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41

Hasan, M. Z., Y. D. Chuang, Y. Li, et al. "Correlated Charge Excitations in Quasi-Low-Dimensional Mott Insulators." International Journal of Modern Physics B 17, no. 18n20 (2003): 3519–24. http://dx.doi.org/10.1142/s0217979203021320.

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We report momentum dependence of charge excitations across the effective Mott gap in quasi-low dimensional model cuprates with different effective dimensionalities ( CuGeO 3 and SrCuO 2), using high resolution inelastic X-ray scattering by working near a resonance. Particle-hole pair excitations at the gap edge in these compounds are found to be strongly dependent on the effective dimensionality of the lattice and the strength of electron–electron Coulomb interaction.

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42

Sunami, Keishi, Ryosuke Takehara, Kazuya Miyagawa, Hiroshi Okamoto, and Kazushi Kanoda. "Topological Excitations in Neutral–Ionic Transition Systems." Symmetry 14, no. 5 (2022): 925. http://dx.doi.org/10.3390/sym14050925.

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The existence and physical properties of topological excitations in ferroelectrics, especially mobile topological boundaries in one dimension, are of profound interest. Notably, topological excitations emerging in association with the neutral–ionic (NI) phase transition are theoretically suggested to carry fractional charges and cause anomalous charge transport. In recent years, we experimentally demonstrated mobile topological excitations in a quasi-one-dimensional (1D) ferroelectric, tetrathiafulvalene-p-chloranil [TTF-CA; TTF (C6H4S4) and CA (C6Cl4O2)], which shows the NI transition, using

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43

Paar, N., T. Marketin, D. Vale, and D. Vretenar. "Modeling nuclear weak-interaction processes with relativistic energy density functionals." International Journal of Modern Physics E 24, no. 09 (2015): 1541004. http://dx.doi.org/10.1142/s0218301315410049.

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Relativistic energy density functionals have become a standard framework for nuclear structure studies of ground state properties and collective excitations over the entire nuclide chart. In this paper, we review recent developments in modeling nuclear weak-interaction processes: Charge-exchange excitations and the role of isoscalar proton–neutron pairing, charged-current neutrino–nucleus reactions relevant for supernova evolution and neutrino detectors and calculation of β-decay rates for r-process nucleosynthesis.

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44

Kuang, Lulin, Yu Lan, Huaisong Zhao, and Shiping Feng. "High-energy magnetic excitations in cuprate superconductors." International Journal of Modern Physics B 29, no. 25n26 (2015): 1542001. http://dx.doi.org/10.1142/s0217979215420011.

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In this paper, the high-energy magnetic excitations in cuprate superconductors are studied based on the kinetic energy driven superconducting mechanism. The spin self-energy is evaluated explicitly in terms of the collective charge carrier modes in the particle–hole and particle–particle channels, and employed to calculate the dynamical spin structure factor. Our results show the existence of damped but well-defined dispersive spin excitations in the whole doping phase diagram. In particular, the charge carrier doping has a more modest effect on the high-energy spin excitations, and then the h

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45

Röösli, Marc P., Michael Hug, Giorgio Nicolí, et al. "Fractional Coulomb blockade for quasi-particle tunneling between edge channels." Science Advances 7, no. 19 (2021): eabf5547. http://dx.doi.org/10.1126/sciadv.abf5547.

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In the fractional quantum Hall effect, the elementary excitations are quasi-particles with fractional charges as predicted by theory and demonstrated by noise and interference experiments. We observe Coulomb blockade of fractional charges in the measured magneto-conductance of a 1.4-micron-wide quantum dot. Interaction-driven edge reconstruction separates the dot into concentric compressible regions with fractionally charged excitations and incompressible regions acting as tunnel barriers for quasi-particles. Our data show the formation of incompressible regions of filling factors 2/3 and 1/3.

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46

Zoppi, Laura, and Kim K. Baldridge. "From charge-transfer excitations to charge-transport phenomena in organic molecular crystals." International Journal of Quantum Chemistry 118, no. 1 (2017): e25413. http://dx.doi.org/10.1002/qua.25413.

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47

Kolmakov, A. A., and V. V. Stankevich. "Inelastic interaction of low-energy mass-selected ions with a surface of solid xenon." Low Temperature Physics 20, no. 11 (1994): 926–28. https://doi.org/10.1063/10.0033736.

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The processes of charge exchange in impingent ions and the formation of electron excitations in inert gas matrices are studied experimentally by considering the example of Xe films bombarded by slow Ne+ and Xe+ ions (Ekin&lt;10 eV) as well as alkali metal ions. It is shown that, at such collision energies, we can neglect the effects of kinetically stimulated charge exchange and matrix excitation. However, these effects must be taken into consideration for Ekin&gt;100 eV. For the ion-surface combinations considered by us, the main channels of charge exchange for slow collisions are the

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48

Drechsler, S. L., J. Málek, R. Hayn, M. Knupfer, A. S. Moskvin та J. Fink. "Low-Energy Charge Excitations in an Undoped Cuprate: Description Beyond the Standard pdσ-Model?" International Journal of Modern Physics B 17, № 18n20 (2003): 3324–28. http://dx.doi.org/10.1142/s0217979203021745.

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Within a joint experimental and theoretical study the density-density response of the prototypical linear chain compound Sr 2 CuO 3 has been investigated by means of polarization and momentum dependent electron energy loss spectroscopy (EELS) and exact diagonalizations including also the continued fraction technique for the determination of spectral densities such as the optical conductivity and the loss function, respectively. It has been shown that the lowest charge excitations of this 1D charge transfer insulator cannot be described properly within the usual pdσ-model for cuprates which is

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49

Moritomo, Y., and Yoshinori Tokura. "Charge-Transfer Type Excitations in Layered Cupric Halides." Japanese Journal of Applied Physics 32, S3 (1993): 344. http://dx.doi.org/10.7567/jjaps.32s3.344.

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LORENZANA, J., and L. YU. "LOCALIZED (POLARONIC) CHARGE-TRANSFER EXCITATIONS IN CuO2 LAYERS." Modern Physics Letters B 05, no. 22 (1991): 1515–23. http://dx.doi.org/10.1142/s0217984991001817.

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Abstract:

We show that the recently found polarons and excitons of charge-transfer origin in the 1D p−d model of high temperature superconductors can also occur in 2D. We use a 2D spinless model which is expected to qualitatively describe the charge degrees of freedom of the p−d model in the limit of infinite on-site Coulomb repulsion on both Cu and O. The Cu-O repulsion Upd is treated by an unrestricted Hartree-Fock scheme. We found that in addition to polarons and excitons, other nonlinear excitations like bipolarons and clustering of carriers (phase separation) arise as well. Since the energies of al

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