Low-frequency dynamics of disordered XY spin chains and pinned density waves: from localized spin waves to soliton tunneling

Details Low-frequency dynamics of disordered XY spin chains and pinned density waves: from localized spin waves to soliton tunneling Low-frequency dynamics of disordered XY spin chains and pinned density waves: from localized spin waves to soliton tunneling

2001-06-18

arxiv.org/abs/cond-mat/0106350v3

Phys. Rev. Lett. 88, 186402 (2002)

Physics

Condensed Matter

Disordered Systems and Neural Networks

(v2) Major improvements in presentation style. One figure added (v3) Another minor change

Scientific paper

10.1103/PhysRevLett.88.186402

A long-standing problem of the low-energy dynamics of a disordered XY spin chain is re-examined. The case of a rigid chain is studied where the quantum effects can be treated quasiclassically. It is shown that as the frequency decreases, the relevant excitations change from localized spin waves to two-level systems to soliton-antisoliton pairs. The linear-response correlation functions are calculated. The results apply to other periodic glassy systems such as pinned density waves, planar vortex lattices, stripes, and disordered Luttinger liquids.

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