Self-bound Bose mixtures

Clemens Staudinger, Ferran Mazzanti, and Robert E. Zillich
Phys. Rev. A 98, 023633 – Published 31 August 2018

Abstract

Recent experiments confirmed that fluctuations beyond the mean-field approximation can lead to self-bound liquid droplets of ultradilute binary Bose mixtures. We proceed beyond the beyond-mean-field approximation and study liquid Bose mixtures by using the variational hypernetted-chain Euler–Lagrange method, which accounts for correlations nonperturbatively. Focusing on the case of a mixture of uniform density, as realized inside large saturated droplets, we study the conditions for stability against evaporation of one of the components (both chemical potentials need to be negative) and against liquid-gas phase separation (spinodal instability), the latter being accompanied by a vanishing speed of sound. Dilute Bose mixtures are stable only in a narrow range near an optimal ratio ρ1/ρ2 and near the total energy minimum. Deviations from a universal dependence on the s-wave scattering lengths are significant despite the low density.

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  • Received 26 April 2018

DOI:https://doi.org/10.1103/PhysRevA.98.023633

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Clemens Staudinger1, Ferran Mazzanti2, and Robert E. Zillich1

  • 1Institute for Theoretical Physics, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria
  • 2Departament de Física i Enginyeria Nuclear, Campus Nord B4-B5, Universitat Politècnica de Catalunya, E-08034 Barcelona, Spain

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Issue

Vol. 98, Iss. 2 — August 2018

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