Realization of a deeply subwavelength adiabatic optical lattice

Published

February 12, 2020

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

Pub Type

Journals

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Keywords

Bose-Einstein Condensate, optical lattice

Citation

Spielman, I. , Valdes, A. , Anderson, R. , Andrijauskas, T. , Juzeliunas, G. , Liang, Q. , Tau, J. , Trypogeorgos, D. and Zhao, M. (2020), Realization of a deeply subwavelength adiabatic optical lattice, Physical Review, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=929051 (Accessed April 25, 2024)