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Ivan Savenko
복잡계 이론물리 연구단
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Valley Hall transport of photon-dressed quasiparticles in two-dimensional Dirac semiconductors

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Title
Valley Hall transport of photon-dressed quasiparticles in two-dimensional Dirac semiconductors
Author(s)
V M Kovalev; Wang-Kong Tse; M V Fistul; I G Savenko
Publication Date
2018-08
Journal
NEW JOURNAL OF PHYSICS, v.20, no., pp.083007 -
Publisher
IOP PUBLISHING LTD
Abstract
We present a theory of the photovoltaic valley-dependent Hall effect in a two-dimensional (2D) Dirac semiconductor subject to an intense near-resonant electromagnetic field. Our theory captures and elucidates the influence of both the field-induced resonant interband transitions and the nonequilibrium carrier kinetics on the resulting valley Hall transport in terms of photon-dressed quasiparticles (PDQs). The non-perturbative renormalization effect of the pump field manifests itself in the dynamics of the PDQs, with a quasienergy spectrum characterized by dynamical gaps δη (η is the valley index) that strongly depend on field amplitude and polarization. Nonequilibrium carrier distribution functions are determined by the pump field frequency ω as well as the ratio of intraband relaxation time τ and interband recombination time τrec. We obtain analytic results in three regimes, when (I) all relaxation processes are negligible, (II) τ=τrec, and (III) τ?τrec, and display corresponding asymptotic dependences on δη and ω. We then apply our theory to 2D transition-metal dichalcogenides, and find a strong enhancement of valley-dependent Hall conductivity as the pump field frequency approaches the transition energies between the pair of spin-resolved conduction and valence bands at the two valleys.
URI
https://pr.ibs.re.kr/handle/8788114/4934
ISSN
1367-2630
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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