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Protocol to engineer Fulde-Ferrell-Larkin-Ovchinnikov states in a cold Fermi gas

By Shovan Dutta and Erich J. Mueller

Abstract

We propose a two-step experimental protocol to directly engineer Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in a cold two-component Fermi gas loaded into a quasi-one-dimensional trap. First, one uses phase imprinting to create a train of domain walls in a superfluid with equal number of $\uparrow$- and $\downarrow$-spins. Second, one applies a radio-frequency sweep to selectively break Cooper pairs near the domain walls and transfer the $\uparrow$-spins to a third spin state which does not interact with the $\uparrow$- and $\downarrow$-spins. The resulting FFLO state has exactly one unpaired $\downarrow$-spin in each domain wall and is stable for all values of domain-wall separation and interaction strength. We show that the protocol can be implemented with high fidelity at sufficiently strong interactions for a wide range of parameters available in present-day experimental conditions.Comment: 9 pages, 3 figures, and reference

Topics: Condensed Matter - Quantum Gases, Condensed Matter - Superconductivity
Publisher: 'American Physical Society (APS)'
Year: 2017
DOI identifier: 10.1103/PhysRevA.96.023612
OAI identifier: oai:arXiv.org:1706.00994

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