A variant transfer matrix method suitable for transport through multi-probe systems

Details A variant transfer matrix method suitable for transport through multi-probe systems A variant transfer matrix method suitable for transport through multi-probe systems

2007-11-27

arxiv.org/abs/0711.4189v1

Nanotech. Vol.18, 435402 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1088/0957-4484/18/43/435402

We have developed a variant transfer matrix method that is suitable for transport through multi-probe systems. Using this method, we have numerically studied the quantum spin Hall effect (QSHE) on 2D graphene with both intrinsic (Vso) and Rashba (Vr) spin-orbit (SO) couplings. The integer QSHE arises in the presence of intrinsic SO interaction and is gradually destroyed by the Rashba SO interaction and disorder fluctuation. We have numerically determined the phase boundaries separating integer QSHE and spin Hall liquid. We have found that when Vso> 0.2t with t the hopping constant the energy gap needed for the integer QSHE is the largest satisfying |E|

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