Edge Currents Induced by AC Electric Field in Two-Dimensional Dirac Structures

Edges in two-dimensional structures are the source of nonlinear transport and optical phenomena which are particularly important in small-size flakes. We present a microscopic theory of the edge photogalvanic effect, i.e., the formation of DC electric current flowing along the sample edges in respon...

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Bibliographic Details
Published in:Applied sciences 2023-04, Vol.13 (7), p.4080
Main Authors: Durnev, Mikhail V., Tarasenko, Sergey A.
Format: Article
Language:English
Subjects:
Alternating current
Bilayers
Current carriers
edge currents
Electric currents
Electric fields
Electric waves
Electromagnetic radiation
Electromagnetic waves
Energy
Graphene
high-frequency nonlinear transport
massive and massless fermions
Monolayers
photogalvanic effect
Radiation
Transport phenomena
two-dimensional Dirac structures
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Summary:Edges in two-dimensional structures are the source of nonlinear transport and optical phenomena which are particularly important in small-size flakes. We present a microscopic theory of the edge photogalvanic effect, i.e., the formation of DC electric current flowing along the sample edges in response to AC electric field of the incident terahertz radiation, for two-dimensional Dirac materials including the systems with massive and massless charge carriers. The edge current direction is controlled by the AC field polarization. The spectral dependence of the current is determined by the carrier dispersion and the mechanism of carrier scattering, as shown for single-layer and bilayer graphene as examples.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13074080