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Realization of a deeply subwavelength adiabatic optical lattice

TitleRealization of a deeply subwavelength adiabatic optical lattice
Publication TypeJournal Article
Year of Publication2020
AuthorsR.. P. Anderson, D.. Trypogeorgos, A.. Valdes-Curiel, Q-Y. Liang, J.. Tao, M.. Zhao, T.. Andrijauskas, G.. Juzeliunas, and I.. B. Spielman
JournalPhys. Rev. Res.
Date Publishedfeb

We propose and describe our realization of a deeply subwavelength optical lattice for ultracold neutral atoms using N resonantly Raman-coupled internal degrees of freedom. Although counterpropagating lasers with wavelength. provided two-photon Raman coupling, the resultant lattice period was lambda/2N, an N-fold reduction as compared to the conventional lambda/2 lattice period. We experimentally demonstrated this lattice built from the three F = 1 Zeeman states of a Rb-87 Bose-Einstein condensate, and generated a lattice with a lambda/6 = 132 nm period from lambda = 790 nm lasers. Lastly, we show that adding an additional rf-coupling field converts this lattice into a superlattice with N wells uniformly spaced within the original lambda/2 unit cell.