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

研究成果: Article査読

抄録

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.

本文言語English
論文番号415502
ジャーナルJournal of Physics Condensed Matter
31
41
DOI
出版ステータスPublished - 2019 7月 15
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学

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