Photon energy dependence of kerr rotation in chalcogenide superlattices

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

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We report on pump-probe based helicity dependent time-resolved Kerr measurements of chalcogenide superlattices, consisting of alternately stacked GeTe and Sb2Te3 layers under infrared excitation. 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 a response function of direct third-order nonlinear susceptibility, the magnitude of the SOKE reflects cascading second-order nonlinear susceptibility resulting from electronic transitions from bulk valence band to interface-originating Dirac states of the superlattice.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2019 Jul 17

ASJC Scopus subject areas

  • General

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