Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature

Li He, Peipei Gao, and Zeng-Qiang Yu
Phys. Rev. Lett. 125, 055301 – Published 31 July 2020
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Abstract

For pseudospin-half bosons with interspin attraction and intraspin repulsion, the normal phase and Bose condensed phase can coexist at finite temperature. The homogeneous system is unstable against the spinodal decomposition within a medium density interval, and, consequently, a normal-superfluid phase separation takes place. The isothermal equation of state shows a characteristic plateau in the PV (pressure-volume) diagram, which is reminiscent of a classical gas-liquid transition, although, unlike the latter, the coexistence lines never terminate at a critical point as temperature increases. In a harmonic trap, the phase separation can be revealed by the density profile of the atomic cloud, which exhibits a sudden jump across the phase boundary.

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  • Received 29 October 2019
  • Accepted 10 July 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.055301

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Statistical Physics & Thermodynamics

Authors & Affiliations

Li He1, Peipei Gao2,3, and Zeng-Qiang Yu2,3,*

  • 1College of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
  • 2Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China
  • 3State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan 030006, China

  • *zqyu.physics@outlook.com

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Issue

Vol. 125, Iss. 5 — 31 July 2020

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