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Realization of a deeply subwavelength adiabatic optical lattice

Published

Author(s)

Ian B. Spielman, Ana Valdes Curiel, Russell P. Anderson, T. Andrijauskas, Gediminas Juzeliunas, Qiyu Liang, Junheng Tau, Dimitrius Trypogeorgos, Mingshu Zhao

Abstract

We propose and realize a deeply sub-wavelength optical lattice for ultracold neutral atoms using $N$ resonantly Raman-coupled internal degrees of freedom. Although counter-propagating lasers with wavelength $\lambda$ 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 $^{87}{\rm Rb}$ Bose-Einstein condensate, and generated a lattice with a $\lambda/6= 132\ {\rm nm}$ period from $\lambda=790 \ {\rm nm}$ 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.
Citation
Physical Review

Keywords

Bose-Einstein Condensate, optical lattice
Created February 12, 2020, Updated May 8, 2020