DISORDERED BOSON SYSTEMS - A PERTURBATIVE STUDY

被引：32

作者：

ZHANG, LZ

机构：

[1] Department of Physics and Astronomy, University of Tennessee, Knoxville

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 21期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.47.14364

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A hard-core disordered boson system is mapped onto a quantum spin-1/2 XY model with transverse random fields. It is then generalized to a system of spins with an arbitrary magnitude S and studied through a 1/S expansion. The first-order 1/S expansion corresponds to a spin-wave theory. The effect of weak disorder is studied perturbatively within such a first-order 1/S scheme. We compute the reduction of the speed of sound and the lifetime of the Bloch phonons in the regime of weak disorder. Generalizations of the present study to the strong disordered regime are discussed.

引用

收藏

页码：14364 / 14373

页数：10

相关论文

共 27 条

[1] THEORY OF DIRTY SUPERCONDUCTORS [J].

ANDERSON, PW .

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1959, 11 (1-2) :26-30

[2]

ANDERSON PW, 1985, PHYS REV B, V32, P5658

[3] UNIVERSAL CONDUCTIVITY OF 2-DIMENSIONAL FILMS AT THE SUPERCONDUCTOR-INSULATOR TRANSITION [J].

CHA, MC ;

FISHER, MPA ;

GIRVIN, SM ;

WALLIN, M ;

YOUNG, AP .

PHYSICAL REVIEW B, 1991, 44 (13) :6883-6902

[4] DISORDER AND THE SUPERFLUID TRANSITION IN LIQUID-HE-4 [J].

CHAN, MHW ;

BLUM, KI ;

MURPHY, SQ ;

WONG, GKS ;

REPPY, JD .

PHYSICAL REVIEW LETTERS, 1988, 61 (17) :1950-1953

[5]

COOKER BC, 1983, PHYS REV LETT, V51, P666

[6] SHARP HEAT-CAPACITY SIGNATURE AT THE SUPERFLUID TRANSITION OF HELIUM FILMS IN POROUS GLASSES [J].

FINOTELLO, D ;

GILLIS, KA ;

WONG, A ;

CHAN, MHW .

PHYSICAL REVIEW LETTERS, 1988, 61 (17) :1954-1957

[7] HELICITY MODULUS, SUPERFLUIDITY, AND SCALING IN ISOTROPIC SYSTEMS [J].

FISHER, ME ;

BARBER, MN ;

JASNOW, D .

PHYSICAL REVIEW A, 1973, 8 (02) :1111-1124

[8]

FISHER MPA, 1989, PHYS REV B, V40, P546, DOI [10.1103/PhysRevB.40.546, 10.1063/1.38820]

[9] ANDERSON LOCALIZATION AND INTERACTIONS IN ONE-DIMENSIONAL METALS [J].

GIAMARCHI, T ;

SCHULZ, HJ .

PHYSICAL REVIEW B, 1988, 37 (01) :325-340

[10] APPLICATION OF SPIN-WAVE THEORY TO THE GROUND-STATE OF XY QUANTUM HAMILTONIANS [J].

GOMEZSANTOS, G ;

JOANNOPOULOS, JD .

PHYSICAL REVIEW B, 1987, 36 (16) :8707-8711