Realization of a deeply subwavelength adiabatic optical lattice

Year: 2020

Authors: Anderson RP., Trypogeorgos D., Valdys-Curiel A., Liang QY., Tao J., Zhao M., Andrijauskas T., Juzeliunas G., Spielman IB.

Autors Affiliation: Univ Maryland, Joint Quantum Inst, College Pk, MD 20742 USA; Monash Univ, Sch Phys & Astron, Melbourne, Vic 3800, Australia; La Trobe Univ, La Trobe Inst Mol Sci, Bendigo, Vic 3552, Australia; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Vilnius Univ, Inst Theoret Phys & Astron, Sauletekio 3, LT-10257 Vilnius, Lithuania; NIST, Gaithersburg, MD 20899 USA.

Abstract: 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.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 2 (1)      Pages from: 13149-1  to: 13149-7

More Information: This work was partially supported by the AFOSR’s Quantum Matter MURI, NIST, and the NSF through the PFC at JQI (Award No. 1430094). We are grateful for insights from the very detailed reading of our manuscript by G. Reid and Y. Yue.
KeyWords: Atoms
DOI: 10.1103/PhysRevResearch.2.013149

Citations: 30
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