Shift charge and spin photocurrents in Dirac surface states of topological insulator

The generation of photocurrent in condensed matter is of main interest for photovoltaic and optoelectronic applications. Shift current, a nonlinear photoresponse, has attracted recent intensive attention as a dominant player of bulk photovoltaic effect in ferroelectric materials. In three dimensiona...

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Bibliographic Details
Published inarXiv.org
Main Authors Kun Woo Kim, Morimoto, Takahiro, Nagaosa, Naoto
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 13.07.2016
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Summary:The generation of photocurrent in condensed matter is of main interest for photovoltaic and optoelectronic applications. Shift current, a nonlinear photoresponse, has attracted recent intensive attention as a dominant player of bulk photovoltaic effect in ferroelectric materials. In three dimensional topological insulators \(\text{Bi}_2\text{X}_3\) (X: Te, Se), we find that Dirac surface states with a hexagonal warping term carry shift current by linearly polarized light. In addition, shift spin-current is introduced with the time-reversal symmetry breaking perturbation. The estimate for the magnitudes of the shift charge- and spin-currents are 0.13\(I_0\) and 0.21\(I_0\)(nA/m) with the intensity of light \(I_0\) measured in \((\text{W}/\text{m}^2)\), respectively, which can offer a useful method to generate these currents efficiently.
ISSN:2331-8422
DOI:10.48550/arxiv.1607.03888