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[交流] 关于QSHE态中的自旋守恒问题

今天在看文献的时候，看到了这样一段话， In the ideal QSHE, the left movers on the edge are correlated with down spin, the right movers have up spin, and the transport is quantized. We dub the edge states of the QSHE a ‘‘helical
liquid,’’ which describes the correlation between the spin and the momentum. As spin is not conserved, the extra SO
interactions (e.g., Rashba) change the quantized nature of the ideal system. However, the edge transport turns out to be quite robust: As long as the bulk gap is not closed, numerical results find that the spin Hall conductance re-mains near the quantized value, being rather insensitive to disorder scattering, until the energy gap collapses with
increasing SO coupling. 这里面提到自旋不守恒。我想问，怎样判断一个体系自旋是否守恒呢？为什么这里QSHE态自旋不守恒呢？

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