Journal article

Relaxation of antiferromagnetic order in spin-1/2 chains following a quantum quench

  • Barmettler, Peter Department of Physics, University of Fribourg, Switzerland
  • Punk, Matthias Department of Physics, Technical University Munich, Garching, Germany
  • Gritsev, Vladimir Department of Physics, University of Fribourg, Switzerland - Department of Physics, Harvard University, Cambridge, MA, USA
  • Demler, Eugene Department of Physics, Harvard University, Cambridge, MA, USA
  • Altman, Ehud Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel
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    01.04.2009
Published in:
  • Physical Review Letters. - 2009, vol. 102, no. 13, p. 130603
English We study the unitary time evolution of antiferromagnetic order in anisotropic Heisenberg chains that are initially prepared in a pure quantum state far from equilibrium. Our analysis indicates that the antiferromagnetic order imprinted in the initial state vanishes exponentially. Depending on the anisotropy parameter, oscillatory or nonoscillatory relaxation dynamics is observed. Furthermore, the corresponding relaxation time exhibits a minimum at the critical point, in contrast to the usual notion of critical slowing down, from which a maximum is expected.
Faculty
Faculté des sciences
Department
Physique
Language
  • English
Classification
Physics
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Persistent URL
https://folia.unifr.ch/unifr/documents/301180
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