High-energy magnon dispersion in the half-filled Hubbard model:: A comparison with La2CuO4 -: art. no. 144420

被引：14

作者：

Sengupta, P ^{[1
]}

Scalettar, RT ^{[1
]}

Singh, RRP ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 14期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.66.144420

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use quantum Monte Carlo methods and the single-mode approximation to study the magnon dispersion in the two-dimensional (2D) half-filled Hubbard and phonon-coupled Heisenberg models. We find that in the Hubbard model with U/t<8, the high-energy magnon dispersion is similar to that observed in inelastic neutron scattering experiments in La2CuO4. On the other hand, our studies of a 2D Heisenberg model coupled to dynamic optical bond phonons fail to reproduce the experimental dispersion. These results can be interpreted as evidence of intermediate U/t and charge fluctuations in the cuprate materials.

引用

页码：1 / 5

页数：5

共 47 条

[21] AN ATTEMPT TO PREPARE LA2CUO4 BY HIGH-ENERGY ION-BEAM MIXING
DESIMONI, J
TRAVERSE, A
MEGTERT, S
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 1992, 12 (1-2): : 13 - 16
[22] AN ATTEMPT TO PREPARE LA2CUO4 BY HIGH-ENERGY ION-BEAM MIXING
DESIMONI, J
TRAVERSE, A
MEGTERT, S
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 1992, 62 (03): : 319 - 321
[23] Nuclear magnetic resonance chemical shifts and paramagnetic field modifications in La2CuO4 -: art. no. 024501
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Heine, T
Weber, J
Meier, PF
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[24] Phase diagram of the half-filled two-dimensional SU(N) Hubbard-Heisenberg model:: A quantum Monte Carlo study -: art. no. 075103
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[25] Spin-wave spectrum in La2CuO4:: Double occupancy and competing interaction effects -: art. no. 092402
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[26] Antiferromagnetism in Zn-doped La2CuO4 as observed by muon spin resonance spectroscopy -: art. no. 184522
Ekström, M
Hartmann, O
Karlsson, E
Lidström, E
Granberg, P
Nygren, M
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[28] Resonant inelastic X-ray scattering study of charge excitations in La2CuO4 -: art. no. 177003
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Hill, JP
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Birgeneau, RJ
Casa, D
Gog, T
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[29] Third-order nonlinear optical spectroscopy in the two-dimensional cuprates Nd2CuO4 and La2CuO4 -: art. no. 075101
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Ono, M
Sawa, A
Kawasaki, M
Tokura, Y
Okamoto, H
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[30] Antiferromagnetic band structure of La2CuO4:: Becke-3-Lee-Yang-Parr calculations -: art. no. 144510
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