Novel approach to description of spin-liquid phases in low-dimensional quantum antiferromagnets

被引：119

作者：

Kotov, VN ^{[1
]}

Sushkov, O ^{[1
]}

Zhang, WH ^{[1
]}

Oitmaa, J ^{[1
]}

机构：

[1] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.80.5790

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider quantum spin systems with dimerization, which at strong coupling have singlet ground states. To account for strong correlations, the S =1 elementary excitations are described as a dilute Bose gas with infinite on-site repulsion. This approach is applied to the two-layer Heisenberg antiferromagnet at T = 0 with general couplings. Our analytic results for the triplet gap, the excitation spectrum, and the location of the quantum critical point are in excellent agreement with numerical results obtained by dimer series expansions. [S0031-9007(98)06407-2].

引用

页码：5790 / 5793

页数：4

共 15 条

[1]

Abrikosov A., 1975, METHODS QUANTUM FIEL

[2] PHASE-TRANSITION, LONGITUDINAL SPIN FLUCTUATIONS, AND SCALING IN A 2-LAYER ANTIFERROMAGNET [J].

CHUBUKOV, AV ;

MORR, DK .

PHYSICAL REVIEW B, 1995, 52 (05) :3521-3532

[3]

CHUBUKOV AV, 1989, JETP LETT+, V49, P129

[4] KONDO LATTICE AND WEAK ANTIFERROMAGNETISM [J].

DONIACH, S .

PHYSICA B & C, 1977, 91 (JUL) :231-234

[5]

EDER R, CONDMAT9712003

[6]

Fetter A. L., 1971, QUANTUM THEORY MANY

[7] SPIN LADDERS WITH SPIN GAPS - A DESCRIPTION OF A CLASS OF CUPRATES [J].

GOPALAN, S ;

RICE, TM ;

SIGRIST, M .

PHYSICAL REVIEW B, 1994, 49 (13) :8901-8910

[8]

MATSUSHITA Y, CONDMAT9707156

[9] BOND-OPERATOR REPRESENTATION OF QUANTUM SPINS - MEAN-FIELD THEORY OF FRUSTRATED QUANTUM HEISENBERG ANTIFERROMAGNETS [J].

SACHDEV, S ;

BHATT, RN .

PHYSICAL REVIEW B, 1990, 41 (13) :9323-9329

[10]

SACHDEV S, 1995, LOW DIMENSIONAL QUAN

← 1 2 →