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Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
We propose models of two-dimensional paramagnetic semiconductors where the intrinsic spin Hall effect is exactly quantized in integer units of a topological charge. The model describes a topological insulator in the bulk and a “holographic metal” at the edge, where the number of extended edge states crossing the Fermi level is dictated by (exactly equal to) the bulk topological charge. We also demonstrate the spin Hall effect explicitly in terms of the spin accumulation caused by the adiabatic flux insertion.
American Physical Society
Physical Review B
Topological insulator; Holographic metal; Edge states
Quantum Hall effect; Paramagnetism; Semiconductors; Condensed matter
Qi, X.-L., Wu, Y.-S., & Zhang, S.-C. (2006). Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors. Physical Review B - Condensed Matter and Materials Physics, 74(8), no.085308.