Some generic aspects of bosonic excitations in disordered systems

被引：47

作者：

Gurarie, V ^{[1
]}

Chalker, JT ^{[1
]}

机构：

[1] Univ Oxford, Oxford OX1 3NP, England

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.89.136801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider noninteracting bosonic excitations in disordered systems, emphasizing generic features of quadratic Hamiltonians in the absence of Goldstone modes. We discuss relationships between such Hamiltonians and the symmetry classes established for fermionic systems. We examine the density rho(omega) of excitation frequencies omega, showing how the universal behavior rho(omega)similar toomega(4) for small omega can be obtained both from general arguments and by detailed calculations for one-dimensional models.

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