Second harmonic generation in graphene dressed by a strong terahertz field

Mikhail Tokman; Sergey B. Bodrov; Yuri A. Sergeev; Alexey I. Korytin; Ivan Oladyshkin; Yongrui Wang; Alexey Belyanin; Andrey N. Stepanov

doi:10.1103/PhysRevB.99.155411

Second harmonic generation in graphene dressed by a strong terahertz field

Mikhail Tokman, Sergey B. Bodrov, Yuri A. Sergeev, Alexey I. Korytin, Ivan Oladyshkin, Yongrui Wang, Alexey Belyanin, Andrey N. Stepanov

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21 Scopus citations

Abstract

We observe enhanced second harmonic generation in monolayer graphene in the presence of an ultrastrong terahertz field pulse of picosecond duration with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second harmonic signal.

Original language	English
Article number	155411
Journal	Physical Review B
Volume	99
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevB.99.155411
State	Published - 10 Apr 2019
Externally published	Yes

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title = "Second harmonic generation in graphene dressed by a strong terahertz field",

abstract = "We observe enhanced second harmonic generation in monolayer graphene in the presence of an ultrastrong terahertz field pulse of picosecond duration with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second harmonic signal.",

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AU - Tokman, Mikhail

AU - Bodrov, Sergey B.

AU - Sergeev, Yuri A.

AU - Korytin, Alexey I.

AU - Oladyshkin, Ivan

AU - Wang, Yongrui

AU - Belyanin, Alexey

AU - Stepanov, Andrey N.

PY - 2019/4/10

Y1 - 2019/4/10

N2 - We observe enhanced second harmonic generation in monolayer graphene in the presence of an ultrastrong terahertz field pulse of picosecond duration with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second harmonic signal.

AB - We observe enhanced second harmonic generation in monolayer graphene in the presence of an ultrastrong terahertz field pulse of picosecond duration with a peak amplitude of 250 kV/cm. This is a strongly nonperturbative regime of light-matter interaction in which particles get accelerated to energies exceeding the initial Fermi energy of 0.2 eV over a timescale of a few femtoseconds. The second harmonic current is generated as electrons drift through the region of momenta corresponding to interband transition resonance at an optical frequency. The resulting strongly asymmetric distortion of carrier distribution in momentum space gives rise to an enhanced electric-dipole nonlinear response at the second harmonic. We develop an approximate analytic theory of this effect which accurately predicts observed intensity and polarization of the second harmonic signal.

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Second harmonic generation in graphene dressed by a strong terahertz field

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