CT invariant quantum spin Hall effect in a ferromagnetic graphene - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




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Abstract: We predict a quantum spin Hall effect QSHE in the ferromagnetic grapheneunder a magnetic field. Unlike the previous QSHE, this QSHE appears in theabsence of any spin-orbit interaction, thus, arrived from a different physicalorigin. The previous QSHE is protected by the time-reversal T invariance.This new QSHE is protected by the CT invariance, where C is the chargeconjugation operation. Due to this QSHE, the longitudinal resistance exhibitsquantum plateaus. The plateau values are at 1-2, 1-6, 3-28,

., in the unitof $h-e^2$, depending on the filling factors of the spin-up and spin-downcarriers. The spin Hall resistance is also investigated and is found to berobust against the disorder.



Author: Qing-feng Sun, X.C. Xie

Source: https://arxiv.org/







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