Spontaneous-symmetry-breaking mechanism of adiabatic pumping

Yaroslav Tserkovnyak and Arne Brataas
Phys. Rev. B 71, 052406 – Published 23 February 2005

Abstract

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 their symmetry-broken states.

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  • Received 2 July 2004

DOI:https://doi.org/10.1103/PhysRevB.71.052406

©2005 American Physical Society

Authors & Affiliations

Yaroslav Tserkovnyak1 and Arne Brataas2

  • 1Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway

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Issue

Vol. 71, Iss. 5 — 1 February 2005

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