GAPLESS SPIN-FLUID GROUND-STATE IN A RANDOM QUANTUM HEISENBERG MAGNET

被引：1424

作者：

SACHDEV, S ^{[1
]}

YE, JW ^{[1
]}

机构：

[1] YALE UNIV,DEPT APPL PHYS,NEW HAVEN,CT 06520

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.70.3339

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We examine the spin-S quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The quantum-disordered phase is accessed by generalizing to SU(M) symmetry and studying the large M limit. For large S the ground state is a spin glass, while quantum fluctuations produce a spin-fluid state for small S. The spin-fluid phase is found to be generically gapless-the average, zero temperature, local dynamic spin susceptibility obeys chiBAR(omega) is similar to ln(1/Absolute value of omega) + i(pi/2)sgn(omega) at low frequencies.

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页码：3339 / 3342

页数：4

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