An edge index for the Quantum Spin-Hall effect

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dc.creatorProdan, Emil
dc.date2008-09-25
dc.date2009-04-06
dc.date.accessioned2026-07-07T13:00:02Z
dc.date.available2026-07-07T13:00:02Z
dc.descriptionQuantum Spin-Hall systems are topological insulators displaying dissipationless spin currents flowing at the edges of the samples. In contradistinction to the Quantum Hall systems where the charge conductance of the edge modes is quantized, the spin conductance is not and it remained an open problem to find the observable whose edge current is quantized. In this paper, we define a particular observable and the edge current corresponding to this observable. We show that this current is quantized and that the quantization is given by the index of a certain Fredholm operator. This provides a new topological invariant that is shown to take same values as the Spin-Chern number previously introduced in the literature. The result gives an effective tool for the investigation of the edge channels' structure in Quantum Spin-Hall systems. Based on a reasonable assumption, we also show that the edge conducting channels are not destroyed by a random edge.
dc.description4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/0809.4511
dc.identifierhttp://arxiv.org/abs/0809.4511
dc.identifierJ. Phys. A: Math. Theor. 42 (2009) 082001
dc.identifierdoi:10.1088/1751-8113/42/8/082001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/225750
dc.subjectMesoscale and Nanoscale Physics
dc.subjectStatistical Mechanics
dc.subjectMathematical Physics
dc.titleAn edge index for the Quantum Spin-Hall effect
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