English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The question whether a spin-imbalanced Fermi gas can accommodate theFulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been the subject of intensestudy. This state, in which Cooper pairs obtain a nonzero momentum, hashitherto eluded experimental observation. Recently, we demonstrated that theFFLO state can be stabilized in a 3D Fermi gas, by adding a 1D periodicpotential. Until now it was assumed that the FFLO wave vector always liesparallel to this periodic potential (FFLO-P). In this contribution we showthat, surprisingly, the FFLO wave vector can also lie skewed with respect tothe potential (FFLO-S). Starting from the partition sum, the saddle-point freeenergy of the system is derived within the path-integral formalism. Minimizingthis free energy allows us to study the different competing ground states ofthe system. To qualitatively understand the underlying pairing mechanism, wevisualize the Fermi surfaces of the spin up and spin down particles. From thisvisualization, we find that tilting the FFLO wave vector with respect to thedirection of the periodic potential, can result in a larger overlap between thepairing bands of both spin species. This skewed FFLO state can provide anadditional experimental signature for observing FFLO superfluidity in a 3DFermi gas.

Controlling the pair momentum of the FFLO state in a 3D Fermi gas through a 1D periodic potential