ELEMENTARY EXCITATIONS FOR THE 2-DIMENSIONAL QUANTUM HEISENBERG-ANTIFERROMAGNET

被引：17

作者：

CHEN, GH

DING, HQ

GODDARD, WA

机构：

[1] Materials Simulation Center, Beckman Institute, California Institute of Technology, Pasadena

来源：

PHYSICAL REVIEW B | 1992年 / 46卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.46.2933

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The excitation spectrum of the antiferromagnetic spin-1/2 Heisenberg Hamiltonian H = SIGMA-JS(i).S(j) on L X L lattices is evaluated by a projector quantum Monte Carlo method. These results suggest that the exact spectrum for the finite lattice is omega-k congruent-to Z(L)omega(k)SW, for all k, where omega(k)SW=4JS square-root 1-gamma(k)2 with gamma-k = (cosk(x)+cosk(y))/2 is from linear-spin-wave theory. We find Z(L)=Z(E)+B/L3, leading to Z(E) = 1.21+/-0.03 for L = infinity. A comparison with experiments on La2CuO4 is discussed.

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页码：2933 / 2938

页数：6

相关论文

共 31 条

[1] MAGNETIC DYNAMICS OF LA2CUO4 AND LA2-XBAXCUO4 [J].

AEPPLI, G ;

HAYDEN, SM ;

MOOK, HA ;

FISK, Z ;

CHEONG, SW ;

RYTZ, D ;

REMEIKA, JP ;

ESPINOSA, GP ;

COOPER, AS .

PHYSICAL REVIEW LETTERS, 1989, 62 (17) :2052-2055

[2] AN APPROXIMATE QUANTUM THEORY OF THE ANTIFERROMAGNETIC GROUND STATE [J].

ANDERSON, PW .

PHYSICAL REVIEW, 1952, 86 (05) :694-701

[3]

[Anonymous], 1962, PHYS REV, DOI DOI 10.1103/PHYSREV.128.2131

[4] FUNCTIONAL INTEGRAL THEORIES OF LOW-DIMENSIONAL QUANTUM HEISENBERG MODELS [J].

AROVAS, DP ;

AUERBACH, A .

PHYSICAL REVIEW B, 1988, 38 (01) :316-332

[5] SPIN DYNAMICS IN THE SQUARE-LATTICE ANTIFERROMAGNET [J].

AUERBACH, A ;

AROVAS, DP .

PHYSICAL REVIEW LETTERS, 1988, 61 (05) :617-620

[6] PROJECTOR MONTE-CARLO METHOD [J].

BLANKENBECLER, R ;

SUGAR, RL .

PHYSICAL REVIEW D, 1983, 27 (06) :1304-1311

[7] GROUND-STATE AND LOW-LYING EXCITATIONS OF THE HEISENBERG-ANTIFERROMAGNET [J].

CARLSON, J .

PHYSICAL REVIEW B, 1989, 40 (01) :846-849

[8] LOW-TEMPERATURE BEHAVIOR OF TWO-DIMENSIONAL QUANTUM ANTIFERROMAGNETS [J].

CHAKRAVARTY, S ;

HALPERIN, BI ;

NELSON, DR .

PHYSICAL REVIEW LETTERS, 1988, 60 (11) :1057-1060

[9] TWO-DIMENSIONAL QUANTUM HEISENBERG-ANTIFERROMAGNET AT LOW-TEMPERATURES [J].

CHAKRAVARTY, S ;

HALPERIN, BI ;

NELSON, DR .

PHYSICAL REVIEW B, 1989, 39 (04) :2344-2371

[10] THE MAGNON PAIRING MECHANISM OF SUPERCONDUCTIVITY IN CUPRATE CERAMICS [J].

CHEN, GH ;

GODDARD, WA .

SCIENCE, 1988, 239 (4842) :899-902

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