2019/10/31 by Li He, Peipei Gao, Zeng-Qiang Yu
Physics and Astronomy · #Boson #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Phase (matter) #Phase boundary #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Plateau (mathematics) #Quantum mechanics #Quantum, superfluid, helium dynamics #Spinodal #Spinodal decomposition #Superfluidity #Thermodynamics #cond-mat.quant-gas
paper · pdf · doi:10.1103/physrevlett.125.055301
published as Phys. Rev. Lett. 125, 055301 (2020) · 6+5 pages, 4+3 figures, published version
openalex publication_date 2020/07/31 · arxiv created 2020/08/01 · arxiv updated 2020/08/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 P-V (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.