CHARGE GAP IN THE ONE-DIMENSIONAL DIMERIZED HUBBARD-MODEL AT QUARTER-FILLING

被引:106
作者
PENC, K [1 ]
MILA, F [1 ]
机构
[1] UNIV TOULOUSE 3, PHYS QUANT LAB, F-31062 TOULOUSE, FRANCE
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 16期
关键词
D O I
10.1103/PhysRevB.50.11429
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We propose a quantitative estimate of the charge gap that opens in the one-dimensional dimerized Hubbard model at quarter-filling due to dimerization, which makes the system effectively half-filled, and to repulsion, which induces umklapp scattering processes. Our estimate is expected to be valid for any value of the repulsion and of the parameter describing the dimerization. It is based on analytical results obtained in various limits (weak coupling, strong coupling, large dimerization) and on numerical results obtained by exact diagonalization of small clusters. We consider two models of dimerization: alternating hopping integrals and alternating on-site energies. The former should be appropriate for the Bechgaard salts, the latter for compounds where the stacks are made of alternating TMTSF and TMTTF molecules. © 1994 The American Physical Society.
引用
收藏
页码:11429 / 11445
页数:17
相关论文
共 24 条
[1]  
BARISIC S, 1981, RECENT DEV CONDENSED, V1, P327
[2]  
BENDER CM, 1987, ADV NUMERICAL METHOD
[3]   TEMPERATURE-DEPENDENCE OF THE TRANSFER INTEGRALS IN THE (TMTSF)2X AND (TMTTF)2X FAMILIES [J].
DUCASSE, L ;
ABDERRABBA, M ;
HOARAU, J ;
PESQUER, M ;
GALLOIS, B ;
GAULTIER, J .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1986, 19 (20) :3805-3820
[4]  
EMERY VJ, 1979, HIGHLY CONDUCTING ON, P1221
[5]   GROUND-STATES AND CRITICAL-TEMPERATURES IN QUASI-ONE-DIMENSIONAL SYSTEMS [J].
FIRSOV, YA ;
PRIGODIN, VN ;
SEIDEL, C .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1985, 126 (5-6) :245-+
[6]   NEUTRON LOW-TEMPERATURE (4-K AND 20-K) AND X-RAY HIGH-PRESSURE (6.5 X 10(2) AND 9.8 X 10(2) MPA) STRUCTURES OF THE ORGANIC SUPERCONDUCTOR DI(2,3,6,7-TETRAMETHYL-1,4,5,8-TETRASELENAFULVALENIUM) HEXAFLUOROPHOSPHATE, (TMTSF)2PF6 [J].
GALLOIS, B ;
GAULTIER, J ;
HAUW, C ;
LAMCHARFI, TD ;
FILHOL, A .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1986, 42 :564-575
[7]   HALDANE GAPS IN A SPIN-1 HEISENBERG CHAIN WITH EASY-PLANE SINGLE-ION-ANISOTROPY [J].
GOLINELLI, O ;
JOLICOEUR, T ;
LACAZE, R .
PHYSICAL REVIEW B, 1992, 45 (17) :9798-9805
[8]   MAGNETIZATION CURVE AT ZERO TEMPERATURE FOR ANTIFERROMAGNETIC HEISENBERG LINEAR CHAIN [J].
GRIFFITHS, RB .
PHYSICAL REVIEW, 1964, 133 (3A) :A768-+
[9]  
JAPARIDZE G, 1993, ANN PHYS-LEIPZIG, V2, P38, DOI 10.1002/andp.19935050105
[10]   ORGANIC CONDUCTORS AND SUPERCONDUCTORS [J].
JEROME, D ;
SCHULZ, HJ .
ADVANCES IN PHYSICS, 1982, 31 (04) :299-490