Single Impurity In Ultracold Fermi Superfluids

Details Single Impurity In Ultracold Fermi Superfluids Single Impurity In Ultracold Fermi Superfluids

2010-10-15

arxiv.org/abs/1010.3222v2

Physical Review A 83, 061604(R) (2011)

Physics

Condensed Matter

Quantum Gases

5 pages, 3 figures; added calculations for 3D

Scientific paper

10.1103/PhysRevA.83.061604

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 mid-gap bound states in a superfluid Fermi gas. The multiple mid-gap states could coincide with the development of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase within the superfluid. As an analog of the Scanning Tunneling Microscope, 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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