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Single impurity in ultracold Fermi superfluids

Lei Jiang, Leslie O. Baksmaty, Hui Hu, Yan Chen, and Han Pu
Phys. Rev. A 83, 061604(R) – Published 22 June 2011

Abstract

The role of impurities as experimental probes in the detection of quantum material properties is well appreciated. Here we study the effect of a single classical magnetic impurity in trapped ultracold Fermi superfluids. Depending on its shape and strength, a magnetic impurity can induce single or multiple midgap bound states in a superfluid Fermi gas. The multiple midgap states could coincide with the development of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase within the superfluid. As an analog of the scanning tunneling microsope, we propose a modified rf spectroscopic method to measure the local density of states which can be employed to detect these states and other quantum phases of cold atoms. A key result of our self-consistent Bogoliubov-de Gennes calculations is that a magnetic impurity can controllably induce an FFLO state at currently accessible experimental parameters.

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  • Received 14 October 2010

DOI:https://doi.org/10.1103/PhysRevA.83.061604

©2011 American Physical Society

Authors & Affiliations

Lei Jiang1, Leslie O. Baksmaty1, Hui Hu2, Yan Chen3, and Han Pu1

  • 1Department of Physics and Astronomy, and Rice Quantum Institute, Rice University, Houston, Texas 77251, USA
  • 2ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122, Australia
  • 3Department of Physics, State Key Laboratory of Surface Physics and Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, China

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Issue

Vol. 83, Iss. 6 — June 2011

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