Short-Time Spin Dynamics in Strongly Correlated Few-Fermion Systems

Sebastiano Peotta, Davide Rossini, Pietro Silvi, G. Vignale, Rosario Fazio, Marco Polini

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The nonequilibrium spin dynamics of a one-dimensional system of repulsively interacting fermions is studied by means of density-matrix renormalization group simulations. We focus on the short-time decay of the oscillation amplitudes of the centers of mass of spin-up and spin-down fermions. Because of many body effects, the decay is found to evolve from quadratic to linear in time, and eventually back to quadratic as the strength of the interaction increases. The characteristic rate of the decay increases linearly with the strength of repulsion in the weak-coupling regime, while it is inversely proportional to it in the strong-coupling regime. Our predictions can be tested in experiments on tunable ultracold few-fermion systems in one-dimensional traps.
Original languageEnglish
Article number245302
Pages (from-to)1-5
JournalPhysical Review Letters
Volume108
Issue number24
DOIs
Publication statusPublished - 15 Jun 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Degenerate Fermi gases
  • Tunneling Josephson effect Bose-Einstein condensates in periodic potentials solitons vortices and topological excitations
  • Nonequilibrium and irreversible thermodynamics
  • Spin polarized transport

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