Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate

Year: 2016

Authors: Martone GI., Ozawa T., Qu CL., Stringari S.

Autors Affiliation: Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; Univ Bari, Dipartimento Fis, I-70126 Bari, Italy; Univ Bari, MECENAS, I-70126 Bari, Italy; Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy; Univ Paris Saclay, Univ Paris 11, CNRS, LPTMS, F-91405 Orsay, France.

Abstract: We investigate the effect of a periodic potential generated by a one-dimensional optical lattice on the magnetic properties of an S = 1/2 spin-orbit-coupled Bose gas. By increasing the lattice strength one can achieve a magnetic phase transition between a polarized and an unpolarized Bloch wave phase, characterized by a significant enhancement of the contrast of the density fringes. If the wave vector of the periodic potential is chosen close to the roton momentum, the transition could take place at very small lattice intensities, revealing the strong enhancement of the response of the system to a weak density perturbation. By solving the Gross-Pitaevskii equation in the presence of a three-dimensional trapping potential, we shed light on the possibility of observing the magnetic phase transition in currently available experimental conditions.

Journal/Review: PHYSICAL REVIEW A

Volume: 94 (4)      Pages from: 43629-1  to: 43629-9

More Information: Useful correspondence and discussions with Peter Engels, Amin Khamehchi, and Yun Li are acknowledged. G.I.M. was partially supported by the PRIN Grant No. 2010LLKJBX Collective quantum phenomena: From strongly correlated systems to quantum simulators and by INFN through the project QUANTUM. The research leading to these results received funding from the European Research Council under European Community’s Seventh Framework Programme (FR7/2007-2013 Grant Agreement No. 341197). T.O., C.Q., and S.S. were supported by ERC through the QGBE grant, by the QUIC grant of the Horizon2020 FET program, and by Provincia Autonoma di Trento. T.O. was also supported by the EU-FET Proactive grant AQuS, Project No. 640800.
KeyWords: Gas
DOI: 10.1103/PhysRevA.94.043629

Citations: 13
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