Spin Dynamics and Andreev-Bashkin Effect in Mixtures of One-Dimensional Bose Gases

Year: 2018

Authors: Parisi L., Astrakharchik G. E., Giorgini S.

Autors Affiliation: Univ Trento, Dipartimento Fis, I-38050 Trento, Italy; CNR, INO BEC Ctr, I-38050 Trento, Italy; Univ Politecn Cataluna, Dept Fis & Engn Nucl, Campus Nord B4-B5, E-08034 Barcelona, Spain.

Abstract: We investigate the propagation of spin waves in two-component mixtures of one-dimensional Bose gases interacting through repulsive contact potentials. By using quantum Monte Carlo methods we calculate static ground-state properties, such as the spin susceptibility and the spin structure factor, as a function of the coupling strengths and we determine the critical parameters for phase separation. In homogeneous mixtures, results of the velocity of spin waves and of its softening close to the critical point of phase separation are obtained by means of hydrodynamic theory and a sum-rule approach. We quantify the nondissipative drag effect, resulting from the Andreev-Bashkin current-current interaction between the two components of the gas, and we show that in the regime of strong coupling it causes a significant suppression of the spin-wave velocity.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 121 (2)      Pages from: 25302-1  to: 25302-6

More Information: We gratefully acknowledge useful discussions with A. Recati and X. W. Guan. This work was supported by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 641122 QUIC, by Provincia Autonoma di Trento and by the Grant No. FIS2014-56257-C2-1-P of the MICINN (Spain). G. E. A. thankfully acknowledges the computer resources at MareNostrum and the technical support provided by Barcelona Supercomputing Center (RES-FI-2017-3-0023).
KeyWords: Quantum Gas; Sum-rules; Fermi Gas; Systems; Spectrum
DOI: 10.1103/PhysRevLett.121.025302

ImpactFactor: 9.227
Citations: 24
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