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Controlling the ac Stark effect of RbCs with dc electric and magnetic fields.

Blackmore, J.A. and Sawant, R. and Gregory, P.D. and Bromley, S.L. and Aldegunde, J. and Hutson, J.M. and Cornish, S.L. (2020) 'Controlling the ac Stark effect of RbCs with dc electric and magnetic fields.', Physical review A., 102 (5). 053316.


We investigate the effects of static electric and magnetic fields on the differential ac Stark shifts for microwave transitions in ultracold bosonic 87Rb133Cs molecules, for light of wavelength λ=1064nm. Near this wavelength we observe unexpected two-photon transitions that may cause trap loss. We measure the ac Stark effect in external magnetic and electric fields, using microwave spectroscopy of the first rotational transition. We quantify the isotropic and anisotropic parts of the molecular polarizability at this wavelength. We demonstrate that a modest electric field can decouple the nuclear spins from the rotational angular momentum, greatly simplifying the ac Stark effect. We use this simplification to control the ac Stark shift using the polarization angle of the trapping laser.

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Publisher statement:Reprinted with permission from the American Physical Society: Blackmore, J.A., Sawant, R., Gregory, P.D., Bromley, S.L., Aldegunde, J., Hutson, J.M. & Cornish, S.L. (2020). Controlling the ac Stark effect of RbCs with dc electric and magnetic fields. Physical Review A 102(5): 053316 © 2020 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:15 September 2020
Date deposited:20 November 2020
Date of first online publication:17 November 2020
Date first made open access:20 November 2020

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