Liquid State of One-Dimensional Bose Mixtures: A Quantum Monte Carlo Study

Year: 2019

Authors: Parisi L., Astrakharchik GE., 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: By using exact quantum Monte Carlo methods we calculate the ground-state properties of the liquid phase in one-dimensional Bose mixtures with contact interactions. We find that the liquid state can be formed if the ratio of coupling strengths between interspecies attractive and intraspecies repulsive interactions exceeds a critical value. As a function of this ratio we determine the density where the energy per particle has a minimum and the one where the compressibility diverges, thereby identifying the equilibrium density and the spinodal point in the phase diagram of the homogeneous liquid. Furthermore, in the stable liquid state, we calculate the chemical potential, the speed of sound, as well as structural and coherence properties, such as the pair correlation function, the static structure factor, and the one-body density matrix, thus providing a detailed description of the bulk region in self-bound droplets.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 122 (10)      Pages from: 105302-1  to: 105302-5

More Information: This work was supported by the QUIC grant of the Horizon 2020 FET program, by Provincia Autonoma di Trento, and by the Grants No. FIS2014-56257-C2-1-P and No. FIS2017-84114-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: GAS; DROPLETS
DOI: 10.1103/PhysRevLett.122.105302

Citations: 70
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