Singular Effects of Spin-Flip Scattering on Gapped Dirac Fermions

We investigate the effects of spin-flip scattering on the Hall transport and spectral properties of gapped Dirac fermions. We find that in the weak scattering regime, the Berry curvature distribution is dramatically compressed in the electronic energy spectrum, becoming singular at band edges. As a...

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Bibliographic Details
Published in:arXiv.org 2011-08
Main Authors: Yang, Shengyuan A, Qiao, Zhenhua, Yao, Yugui, Shi, Junren, Niu, Qian
Format: Article
Language:English
Subjects:
Curvature
Energy spectra
Fermions
Polarization (spin alignment)
Scattering
Online Access:Get full text
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Summary:We investigate the effects of spin-flip scattering on the Hall transport and spectral properties of gapped Dirac fermions. We find that in the weak scattering regime, the Berry curvature distribution is dramatically compressed in the electronic energy spectrum, becoming singular at band edges. As a result the Hall conductivity has a sudden jump (or drop) of \(e^2/2h\) when the Fermi energy sweeps across the band edges, and otherwise is a constant quantized in units of \(e^2/2h\). In parallel, spectral properties such as the density of states and spin polarization are also greatly enhanced at band edges. Possible experimental methods to detect these effects are discussed.
ISSN:2331-8422
DOI:10.48550/arxiv.1011.4083