期刊
JOURNAL OF PHYSICS-CONDENSED MATTER
卷 31, 期 41, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ab2e9f
关键词
chalcogenide superlattices; inverse Faraday effect; Optical Kerr effect; ultrafast spectroscopy
资金
- CREST [JPMJCR14F1, JPMJCR1875]
- JST, Japan
- Japan Society for the Promotion of Science [17H06088]
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.
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