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Some generic aspects of bosonic excitations in disordered systems.

Abstract:
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) approximately omega(4) for small omega can be obtained both from general arguments and by detailed calculations for one-dimensional models.
Publication status:
Published

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Theoretical Physics
Role:
Author
Journal:
Physical Review Letters More from this journal
Volume:
89
Issue:
13
Pages:
136801
Publication date:
2002-09-01
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Language:
English
Keywords:
Pubs id:
pubs:14033
UUID:
uuid:fe5f7c5c-0f9e-4b14-bce8-b9cec1352f12
Local pid:
pubs:14033
Source identifiers:
14033
Deposit date:
2012-12-19

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