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Title

Single impurity in ultracold Fermi superfluids

Author(s)

Jiang, Lei;  Baksmaty, Leslie O.;  Hu, Hui;  Chen, Yan;  Pu, Han

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 amagnetic impurity can controllably induce an FFLO state at currently accessible experimental parameters.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy. Centre of Excellence for Quantum-Atom Optics

Source

Physical Review A, Vol. 83, no. 6 (Jun 2011), paper no. 061604

Publication year

2011

FOR Code(s)

0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics;  0204 Condensed Matter Physics;  0205 Optical Physics

Keyword(s)

Fermi gases;  Magnetic impurities;  Pairing gap;  Spectroscopy;  Superconductors;  Superfluids;  Ultracold gases

Publisher

American Physical Society

ISSN

1050-2947

Publisher URL

http://dx.doi.org/10.1103/PhysRevA.83.061604

Copyright

Copyright © 2011 American Physical Society. Published version of the paper reproduced here with the kind permission of the publisher.

Research Projects

Ultracold atomic Fermi gases in the strongly interacting regime: a new frontier of quantum many-body physics, Australian Research Council grant number DP0984522

Full text

Peer reviewed