Edge photocurrent driven by terahertz electric field in bilayer graphene

Candussio, S.; Durnev, M. V.; Tarasenko, S. A.; Yin, Jun; Keil, Jan-Niklas; Yang, Yaping; Son, Seok‐Kyun; Mishchenko, Artem; Plank, H.; Belkov, Vassilij; Slizovskiy, Sergey; Ganichev, Sergey

doi:10.1103/physrevb.102.045406

Cited by 25 publications

(39 citation statements)

References 51 publications

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“…The even-order harmonics are characteristic to the TBG and cannot appear in the monolayer or conventional AAand AB-stacked bilayers [74] that have inversion centers [75] although the interlayer bias can give rise to the evenorder harmonics [76,77]. The selection rules that J x (J y ) has n plotted against the input field amplitude E 0 .…”

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confidence: 99%

High-order nonlinear optical response of a twisted bilayer graphene

Ikeda

2020

Phys. Rev. Research

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Focusing on the twist angle for the minimal commensurate structure, we perform nonperturbative calculations of electron dynamics in the twisted bilayer graphene (TBG) under intense laser fields. We show that the TBG exhibits enriched high-harmonic generation that cannot occur in monolayer or conventional bilayers. We elucidate the mechanism of these nonlinear responses by analyzing dynamical symmetries, momentum-resolved dynamics, and roles of interlayer coupling. Our results imply nonlinear "optotwistronics," or controlling optical properties of layered materials by artificial twists.

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confidence: 99%

High-order nonlinear optical response of a twisted bilayer graphene

Ikeda

2020

Phys. Rev. Research

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“…The field

E (x)

consists of the field of irradiating wave E and the screening field

δ E (x) ∥ x

produced by charge accumulation near the edge. [ 19,23,24 ] As a result, the component

{scriptE}_{x}

at the edge differs from

E_{x}

but

{scriptE}_{x} \propto E_{x}

. The Boltzmann approach is valid for the classical range of the radiation frequencies, i.e.,

ω ≪ \overset{false¯}{ε} / ℏ

, where

\overset{ε}{true}

is the mean kinetic energy of electrons and ℏ is the reduced Planck constant.…”

Section: Kinetic Theorymentioning

confidence: 99%

“…P ‐symmetry breaking, required for the AC–DC conversion to occur, is also naturally introduced by surfaces in finite‐size bulk (3D) crystals or by edges in finite‐size 2D systems. This gives rise to surface [ 14–17 ] and edge [ 18–21 ] mechanisms of the electric rectification, also in those systems where the AC–DC conversion in the bulk is forbidden by symmetry. The generation of direct edge currents by AC electric field of terahertz radiation has been observed and studied, both experimentally and theoretically, in graphene [ 18 ] and very recently in graphene bilayers.…”

Section: Introductionmentioning

confidence: 99%

“…The generation of direct edge currents by AC electric field of terahertz radiation has been observed and studied, both experimentally and theoretically, in graphene [ 18 ] and very recently in graphene bilayers. [ 19 ] It has been shown that the edge current can be excited by both linearly polarized and circularly polarized radiation (see Figure 1 ). For linearly polarized radiation (Figure 1a), the edge current reaches maxima when the vector of electric field is oriented at the angle

\pm π / 4

with respect to the edge and vanishes when the field is polarized along or perpendicular to the edge.…”

Section: Introductionmentioning

confidence: 99%

“…The microscopic theory, developed in the relaxation time approximation, describes the current magnitude and its polarization dependence. [ 19 ] It shows that the edge current is formed in a narrow stripe near the edge and consists of two contributions. The first contribution originates from the alignment of electron momenta by AC electric field.…”

Section: Introductionmentioning

confidence: 99%

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Rectification of AC Electric Current at the Edge of 2D Electron Gas

Durnev

Tarasenko

2020

Physica Status Solidi (b)

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Driving a 2D electron gas by AC electric field leads to a DC electric current flowing along the edge of the system. The effect is caused by the local breaking of space inversion symmetry at the edge. The current is generated in a narrow stripe determined by the screening length of the AC electric field and the mean free path of carriers. The developed microscopic theory of the effect shows that the excitation spectrum of the edge current and even the current direction depend on the mechanism of electron scattering. In an external magnetic field, the excitation spectrum of the current features the cyclotron resonance.

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