HOLES AND MAGNETIC TEXTURES IN THE 2-DIMENSIONAL HUBBARD-MODEL

被引：36

作者：

BISHOP, AR

GUINEA, F

LOMDAHL, PS

LOUIS, E

VERGES, JA

机构：

[1] UNIV AUTONOMA MADRID,CSIC,INST CIENCIA MAT,E-28049 MADRID,SPAIN

[2] UNIV ALICANTE,FAC CIENCIAS,E-03060 ALICANTE,SPAIN

来源：

EUROPHYSICS LETTERS | 1991年 / 14卷 / 02期

关键词：

D O I：

10.1209/0295-5075/14/2/011

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Hubbard model in a two-dimensional square lattice is studied within the unrestricted Hartree-Fock approximation. A wide variety of solutions are found, as a function of filling and value of the Coulomb repulsion. Their properties range from those of magnetic polarons to a behavior similar to electrons in an external magnetic field (flux phases). The main features of the vortex solution are studied. It is shown that its energy increases logarithmically with system size, and that it becomes more stable for high values of the Coulomb repulsion and doping levels. Also, multivortex configurations are shown to exist. The implications of our results in the qualitative behavior of the Hubbard model as function of doping and strength of the interaction are discussed.

引用

页码：157 / 163

页数：7

共 20 条

[1] SU(2) GAUGE-SYMMETRY OF THE LARGE-U LIMIT OF THE HUBBARD-MODEL [J].

AFFLECK, I ;

ZOU, Z ;

HSU, T ;

ANDERSON, PW .

PHYSICAL REVIEW B, 1988, 38 (01) :745-747

[2] MAGNETIC PHASE-DIAGRAM AND MAGNETIC PAIRING IN DOPED LA2CUO4 [J].

AHARONY, A ;

BIRGENEAU, RJ ;

CONIGLIO, A ;

KASTNER, MA ;

STANLEY, HE .

PHYSICAL REVIEW LETTERS, 1988, 60 (13) :1330-1333

[3]

ANDERSON PW, PRINCETON PREPRINT

[4]

BALATSKII AV, 1989, JETP LETT+, V49, P236

[5] PHASE-SEPARATION IN THE T-J MODEL [J].

EMERY, VJ ;

KIVELSON, SA ;

LIN, HQ .

PHYSICAL REVIEW LETTERS, 1990, 64 (04) :475-478

[6] SUPERCONDUCTING GROUND-STATE OF NONINTERACTING PARTICLES OBEYING FRACTIONAL STATISTICS [J].

LAUGHLIN, RB .

PHYSICAL REVIEW LETTERS, 1988, 60 (25) :2677-2680

[7] SUPERCONDUCTIVITY FROM COMMENSURATE FLUX PHASES [J].

LEDERER, P ;

POILBLANC, D ;

RICE, TM .

PHYSICAL REVIEW LETTERS, 1989, 63 (14) :1519-1522

[8] GAUGE FIELD, AHARONOV-BOHM FLUX, AND HIGH-TC SUPERCONDUCTIVITY [J].

LEE, PA .

PHYSICAL REVIEW LETTERS, 1989, 63 (06) :680-683

[9] LARGE-N LIMIT OF THE HUBBARD-HEISENBERG MODEL [J].

MARSTON, JB ;

AFFLECK, I .

PHYSICAL REVIEW B, 1989, 39 (16) :11538-11558

[10] FERROMAGNETISM IN A NARROW ALMOST HALF-FILLED S BAND [J].

NAGAOKA, Y .

PHYSICAL REVIEW, 1966, 147 (01) :392-&

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