Pumping approximately integrable systems - Kölner UniversitätsPublikationsServer

Lange, Florian, Lenarcic, Zala ORCID: 0000-0001-8374-8011 and Rosch, Achim ORCID: 0000-0002-6586-5721 (2017). Pumping approximately integrable systems. Nat. Commun., 8. LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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DOI:10.1038/ncomms15767

Abstract

Weak perturbations can drive an interacting many-particle system far from its initial equilibrium state if one is able to pump into degrees of freedom approximately protected by conservation laws. This concept has for example been used to realize Bose-Einstein condensates of photons, magnons and excitons. Integrable quantum systems, like the one-dimensional Heisenberg model, are characterized by an infinite set of conservation laws. Here, we develop a theory of weakly driven integrable systems and show that pumping can induce large spin or heat currents even in the presence of integrability breaking perturbations, since it activates local and quasi-local approximate conserved quantities. The resulting steady state is qualitatively captured by a truncated generalized Gibbs ensemble with Lagrange parameters that depend on the structure but not on the overall amplitude of perturbations nor the initial state. We suggest to use spin-chain materials driven by terahertz radiation to realize integrability-based spin and heat pumps.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Lange, Florian	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Lenarcic, Zala	UNSPECIFIED	orcid.org/0000-0001-8374-8011	UNSPECIFIED
Rosch, Achim	UNSPECIFIED	orcid.org/0000-0002-6586-5721	UNSPECIFIED