Dissipative dynamics of a driven quantum spin coupled to a bath of ultracold fermions

Michael Knap, Dmitry A. Abanin, Eugene Demler

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We explore the dynamics and the steady state of a driven quantum spin coupled to a bath of fermions, which can be realized with a strongly imbalanced mixture of ultracold atoms using currently available experimental tools. Radio-frequency driving can be used to induce tunneling between the spin states. The Rabi oscillations are modified due to the coupling of the quantum spin to the environment, which causes frequency renormalization and damping. The spin-bath coupling can be widely tuned by adjusting the scattering length through a Feshbach resonance. When the scattering potential creates a bound state, by tuning the driving frequency it is possible to populate either the ground state, in which the bound state is filled, or a metastable state in which the bound state is empty. In the latter case, we predict an emergent inversion of the steady-state magnetization. Our work shows that different regimes of dissipative dynamics can be explored with a quantum spin coupled to a bath of ultracold fermions.

Original languageEnglish (US)
Article number265302
JournalPhysical review letters
Volume111
Issue number26
DOIs
StatePublished - Dec 27 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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