Spin segregation via dynamically induced long-range interactions in a system of ultracold fermions

Ulrich Ebling, André Eckardt, and Maciej Lewenstein
Phys. Rev. A 84, 063607 – Published 5 December 2011

Abstract

We investigate theoretically the time evolution of a one-dimensional system of spin-1/2 fermions in a harmonic trap after, initially, a spiral spin configuration far from equilibrium is created. We predict a spin segregation building up in time already for weak interaction under realistic experimental conditions. The effect relies on the interplay between exchange interaction and the harmonic trap, and it is found for a wide range of parameters. It can be understood as a consequence of an effective, dynamically induced long-range interaction that is derived by integrating out the rapid oscillatory dynamics in the trap.

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  • Received 13 April 2011

DOI:https://doi.org/10.1103/PhysRevA.84.063607

©2011 American Physical Society

Authors & Affiliations

Ulrich Ebling1, André Eckardt1,2,*, and Maciej Lewenstein1,3

  • 1ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain
  • 2Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany
  • 3Institucio Catalana de Recerca i Estudis Avançats, Lluis Companys 23, E-08010 Barcelona, Spain

  • *eckardt@pks.mpg.de

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Vol. 84, Iss. 6 — December 2011

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