Spontaneous-Symmetry-Breaking Mechanism of Adiabatic Pumping

Details Spontaneous-Symmetry-Breaking Mechanism of Adiabatic Pumping Spontaneous-Symmetry-Breaking Mechanism of Adiabatic Pumping

2004-07-02

arxiv.org/abs/cond-mat/0407067v2

Phys. Rev. B 71 (2005) 052406

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevB.71.052406

We consider heterostructures consisting of regions with a continuous symmetry in contact with regions wherein the symmetry is spontaneously broken. The low-frequency dynamics of the corresponding order parameter are shown to induce nonequilibrium transport, a ``pumping,'' out of the symmetry-broken regions, which is governed by the generator of the broken-symmetry operator. This pumping damps Goldstone-mode excitations and transfers them beyond traditional (static) proximity length scales. Our general conclusions are discussed for specific examples of order parameters in helimagnets, charge/spin-density waves, superconductors, and ferromagnets. We carry out a detailed calculation of such pumping for spiral magnetic orders in helimagnets possessing a duality in the representation of its symmetry-broken states.

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