Bose condensation and electron pairing in one-dimensional Hubbard model

被引：6

作者：

Kocharian, AN ^{[1
]}

Yang, C

Chiang, YL

机构：

[1] Calif State Univ Northridge, Dept Phys & Astron, Northridge, CA 91330 USA

[2] Tamkang Univ, Dept Phys, Tamsui 251, Taiwan

[3] Chinese Culture Univ, Dept Phys, Taipei 111, Taiwan

来源：

INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 1999年 / 13卷 / 29-31期

关键词：

Hubbard model; ground-state; Bethe-ansatz; BCS pairing; electron-hole pairing; Bose condensation; crossover;

D O I：

10.1142/S0217979299003386

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The ground-state properties in oils-dimensional Hubbard model with on-site attraction and repulsion of electrons in the presence of magnetic field h are calculated by means of the exact Bethe-ansatz formalism and the generalized self-consistent field (GSCF) approach for general electron concentrations n and arbitrary interaction strength. The ground-state properties, including the energy, the average spin (magnetization) and the kinetic energy are compared over it wide range of parameter space. The GSCF theory is in qualitative and in some cases in good quantitative agreement with the exact result.. The GSCF theory at U less than or equal to 0 (or U greater than or equal to 0) differentiates the spin (or charge) energy gap from the BCS (or antiferromagnetic) order parameter and suggests a smooth crossover from the: phase with the itinerant BCS-Like behavior to the Bose condensation regime of the local pairs.

引用

页码：3538 / 3545

页数：8

共 13 条

[1] GAP IN THE SPIN EXCITATIONS AND MAGNETIZATION CURVE OF THE ONE-DIMENSIONAL ATTRACTIVE HUBBARD-MODEL [J].

BAHDER, TB ;

WOYNAROVICH, F .

PHYSICAL REVIEW B, 1986, 33 (04) :2114-2121

[2] FRUSTRATED ELECTRONIC PHASE-SEPARATION AND HIGH-TEMPERATURE SUPERCONDUCTORS [J].

EMERY, VJ ;

KIVELSON, SA .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1993, 209 (04) :597-621

[3] SUPERCONDUCTIVITY IN STRONG SPIN-EXCHANGE FIELD [J].

FULDE, P ;

FERRELL, RA .

PHYSICAL REVIEW, 1964, 135 (3A) :A550-+

[4]

GUPTA A, 1998, B AM PHYS SOC, V43, P666

[5] Crossover in the attractive one-dimensional Hubbard model for general electron concentrations [J].

Kocharian, AN ;

Yang, C ;

Chiang, YL ;

Kioussis, N .

PHYSICA B-CONDENSED MATTER, 1999, 259-61 :739-741

[6] Self-consistent and exact studies of pairing correlations and crossover in the one-dimensional attractive Hubbard model [J].

Kocharian, AN ;

Yang, C ;

Chiang, YL .

PHYSICAL REVIEW B, 1999, 59 (11) :7458-7472

[7] THERMODYNAMIC BETHE-ANSATZ EQUATIONS FOR THE HUBBARD CHAIN WITH AN ATTRACTIVE INTERACTION [J].

LEE, KJB ;

SCHLOTTMANN, P .

PHYSICAL REVIEW B, 1988, 38 (16) :11566-11571

[8] ABSENCE OF MOTT TRANSITION IN AN EXACT SOLUTION OF SHORT-RANGE 1-BAND MODEL IN 1 DIMENSION [J].

LIEB, EH ;

WU, FY .

PHYSICAL REVIEW LETTERS, 1968, 20 (25) :1445-+

[9] BOSE CONDENSATION IN AN ATTRACTIVE FERMION GAS - FROM WEAK TO STRONG COUPLING SUPERCONDUCTIVITY [J].

NOZIERES, P ;

SCHMITTRINK, S .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1985, 59 (3-4) :195-211

[10] BCS THEORY TESTED IN AN EXACTLY SOLVABLE FERMION FLUID [J].

QUICK, RM ;

ESEBBAG, C ;

DELLANO, M .

PHYSICAL REVIEW B, 1993, 47 (17) :11512-11514

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