Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation

Physical Review Letters
Gregor JotzuTilman Esslinger

Abstract

We demonstrate a versatile method for creating state-dependent optical lattices by applying a magnetic field gradient modulated in time. This allows for tuning the relative amplitude and sign of the tunneling for different internal states. We observe substantially different momentum distributions depending on the spin state of fermionic ^{40}K atoms. Using dipole oscillations, we probe the spin-dependent band structure and find good agreement with theory. In situ expansion dynamics demonstrate that one state can be completely localized while others remain itinerant. A systematic study shows negligible heating and lifetimes of several seconds in the Hubbard regime.

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Citations

Jan 2, 2016·Physical Review Letters·Lei WangGergely Harcos
Jan 3, 2018·Reports on Progress in Physics·Jami J KinnunenPäivi Törmä
Oct 16, 2016·Physical Review Letters·Andrey E AntipovStefan Kirchner
Dec 24, 2016·Physical Review Letters·Zhigang Wu, G M Bruun
Apr 26, 2018·Physical Review Letters·L RieggerS Fölling
Dec 24, 2018·Physical Review Letters·Michael MesserTilman Esslinger
Apr 24, 2019·Physical Review Letters·Owen HowellMarin Bukov
Jan 15, 2016·Physical Review Letters·Daniel GreifTilman Esslinger
Aug 7, 2019·Physical Review Letters·Boris ShteynasWolfgang Ketterle
Apr 13, 2019·Physical Review Letters·Miguel GonçalvesEduardo V Castro

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