Photon energy dependence of Kerr rotation in GeTe/Sb2Te3 chalcogenide superlattices

Takara Suzuki; Richarj Mondal; Yuta Saito; Paul Fons; Alexander V. Kolobov; Junji Tominaga; Hidemi Shigekawa; Muneaki Hase

doi:10.1088/1361-648X/ab2e9f

Photon energy dependence of Kerr rotation in GeTe/Sb₂Te₃ chalcogenide superlattices

Takara Suzuki, Richarj Mondal, Yuta Saito, Paul Fons, Alexander V. Kolobov, Junji Tominaga, Hidemi Shigekawa, Muneaki Hase

Research output: Contribution to journal › Article › peer-review

Abstract

We report on pump-probe based helicity dependent time-resolved Kerr measurements under infrared excitation of chalcogenide superlattices, consisting of alternately stacked GeTe and Sb₂Te₃ layers. The Kerr rotation signal consists of the specular inverse Faraday effect (SIFE) and the specular optical Kerr effect (SOKE), both of which are found to monotonically increase with decreasing photon energy over a sub-eV energy range. Although the dependence of the SIFE can be attributed to the response function of direct third-order nonlinear susceptibility, the magnitude of the SOKE reflects cascading second-order nonlinear susceptibility resulting from electronic transitions between bulk valence/conduction bands and interface-originating Dirac states of the superlattice.

Original language	English
Article number	415502
Journal	Journal of Physics Condensed Matter
Volume	31
Issue number	41
DOIs	https://doi.org/10.1088/1361-648X/ab2e9f
Publication status	Published - 2019 Jul 15
Externally published	Yes

Keywords

chalcogenide superlattices
inverse Faraday effect
Optical Kerr effect
ultrafast spectroscopy

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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title = "Photon energy dependence of Kerr rotation in GeTe/Sb2Te3 chalcogenide superlattices",

abstract = "We report on pump-probe based helicity dependent time-resolved Kerr measurements under infrared excitation of chalcogenide superlattices, consisting of alternately stacked GeTe and Sb2Te3 layers. The Kerr rotation signal consists of the specular inverse Faraday effect (SIFE) and the specular optical Kerr effect (SOKE), both of which are found to monotonically increase with decreasing photon energy over a sub-eV energy range. Although the dependence of the SIFE can be attributed to the response function of direct third-order nonlinear susceptibility, the magnitude of the SOKE reflects cascading second-order nonlinear susceptibility resulting from electronic transitions between bulk valence/conduction bands and interface-originating Dirac states of the superlattice.",

keywords = "chalcogenide superlattices, inverse Faraday effect, Optical Kerr effect, ultrafast spectroscopy",

author = "Takara Suzuki and Richarj Mondal and Yuta Saito and Paul Fons and Kolobov, {Alexander V.} and Junji Tominaga and Hidemi Shigekawa and Muneaki Hase",

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language = "English",

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TY - JOUR

T1 - Photon energy dependence of Kerr rotation in GeTe/Sb2Te3 chalcogenide superlattices

AU - Suzuki, Takara

AU - Mondal, Richarj

AU - Saito, Yuta

AU - Fons, Paul

AU - Kolobov, Alexander V.

AU - Tominaga, Junji

AU - Shigekawa, Hidemi

AU - Hase, Muneaki

PY - 2019/7/15

Y1 - 2019/7/15

N2 - We report on pump-probe based helicity dependent time-resolved Kerr measurements under infrared excitation of chalcogenide superlattices, consisting of alternately stacked GeTe and Sb2Te3 layers. The Kerr rotation signal consists of the specular inverse Faraday effect (SIFE) and the specular optical Kerr effect (SOKE), both of which are found to monotonically increase with decreasing photon energy over a sub-eV energy range. Although the dependence of the SIFE can be attributed to the response function of direct third-order nonlinear susceptibility, the magnitude of the SOKE reflects cascading second-order nonlinear susceptibility resulting from electronic transitions between bulk valence/conduction bands and interface-originating Dirac states of the superlattice.

AB - We report on pump-probe based helicity dependent time-resolved Kerr measurements under infrared excitation of chalcogenide superlattices, consisting of alternately stacked GeTe and Sb2Te3 layers. The Kerr rotation signal consists of the specular inverse Faraday effect (SIFE) and the specular optical Kerr effect (SOKE), both of which are found to monotonically increase with decreasing photon energy over a sub-eV energy range. Although the dependence of the SIFE can be attributed to the response function of direct third-order nonlinear susceptibility, the magnitude of the SOKE reflects cascading second-order nonlinear susceptibility resulting from electronic transitions between bulk valence/conduction bands and interface-originating Dirac states of the superlattice.

KW - chalcogenide superlattices

KW - inverse Faraday effect

KW - Optical Kerr effect

KW - ultrafast spectroscopy

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