»ã±¨±êÌ⣺º¬ÓÐ×ÔÐý¹ì·ñîºÏµÄÏ໥×÷Óò£É«Ô­×ÓµÄBeliaevË¥¼õ(Baliaev Damping in Interacting Bosons with Spin-orbit Coupling)

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Beliaev damping provides one of the most important mechanisms for dissipation of quasiparticles through beyond-mean-field effects at zero temperature. Here we present the first analytical result of Beliaev damping in low-energy excitations of interacting bosons with equal Rashba and Dresslhaus spin-orbit couplings. We identify novel features of Beliaev decay rate due to spin-orbit coupling, in particular, it shows explicit dependence on the spin-density interaction and diverges at the interaction-modified phase boundary between the zero-momentum and plane-wave phases. This represents a manifestation of the effect of spin-orbit coupling in the beyond-mean-field regime, which by breaking Galilean invariance couples excitations in the density- and spin-channels. By describing the Beliaev damping in terms of the observable dynamic structure factors, our results allow direct experimental access within current facilities.

Ref. Rukuan Wu and Zhaoxin Liang, arXiv: 1802.10295