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Normal-Superfluid Phase Separation in Spin-Half Bosons at Finite Temperature
Physical Review Letters ( IF 8.385 ) Pub Date : 2020-07-31 , DOI: 10.1103/physrevlett.125.055301
Li He; Peipei Gao; Zeng-Qiang Yu

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.
更新日期:2020-07-31

 

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