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 journalArticle

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 languageEnglish
Article number415502
JournalJournal of Physics Condensed Matter
Volume31
Issue number41
DOIs
Publication statusPublished - 2019 Jul 15
Externally publishedYes

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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    Suzuki, T., Mondal, R., Saito, Y., Fons, P., Kolobov, A. V., Tominaga, J., Shigekawa, H., & Hase, M. (2019). Photon energy dependence of Kerr rotation in GeTe/Sb2Te3 chalcogenide superlattices. Journal of Physics Condensed Matter, 31(41), [415502]. https://doi.org/10.1088/1361-648X/ab2e9f