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Condens. Matter 2018, 3(2), 14; https://doi.org/10.3390/condmat3020014

Effective Control of Chemical Potentials by Rabi Coupling with RF-Fields in Ultracold Mixtures

1
Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, via Vetoio, I-67010 Coppito-L’Aquila, Italy
2
INFN, Laboratori Nazionali del Gran Sasso, via G. Acitelli, 22, I-67100 Assergi (AQ), Italy
3
SISSA, via Bonomea 265, I-34136 Trieste, Italy
4
Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, A-6020 Innsbruck, Austria
5
Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria
6
ICFO–Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain
7
Dipartimento di Fisica e Astronomia “Galileo Galilei”, Università di Padova, via Marzolo 8, I-35131 Padova, Italy
8
CNR-IOM DEMOCRITOS Simulation Center, via Bonomea 265, I-34136 Trieste, Italy
*
Author to whom correspondence should be addressed.
Received: 19 February 2018 / Revised: 5 April 2018 / Accepted: 12 April 2018 / Published: 17 April 2018
(This article belongs to the Special Issue Proceedings of the conference SuperFluctuations 2017)
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Abstract

We show that a linear term coupling the atoms of an ultracold binary mixture provides a simple method to induce an effective and tunable population imbalance between them. This term is easily realized by Rabi coupling between different hyperfine levels of the same atomic species. The resulting effective imbalance holds for one-particle states dressed by the Rabi coupling and obtained by diagonalizing the mixing matrix of the Rabi term. This way of controlling the chemical potentials applies to both bosonic and fermionic atoms and it also allows for spatially- and temporally-dependent imbalances. As a first application, we show that, in the case of two attractive fermionic hyperfine levels with equal chemical potentials coupled by the Rabi pulse, the same superfluid properties of an imbalanced binary mixture are recovered. We finally discuss the properties of m-species mixtures in the presence of SU(m)-invariant interactions. View Full-Text
Keywords: quantum gases; multicomponent mixtures; rf-fields; Rabi coupling; imbalanced mixtures quantum gases; multicomponent mixtures; rf-fields; Rabi coupling; imbalanced mixtures
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Lepori, L.; Maraga, A.; Celi, A.; Dell’Anna, L.; Trombettoni, A. Effective Control of Chemical Potentials by Rabi Coupling with RF-Fields in Ultracold Mixtures. Condens. Matter 2018, 3, 14.

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