Femtosecond to picosecond transient effects in WSe2 observed by pump-probe angle-resolved photoemission spectroscopy

Liu, Ro -Ya; Ogawa, Yu; Chen, Peng; Ozawa, Kenichi; Suzuki, Takeshi; Okada, Masaru; Someya, Takashi; Ishida, Yukiaki; Okazaki, Kozo; Shin, Shik; Chiang, Tai -Chang; Matsuda, Iwao

doi:10.1038/s41598-017-16076-z

Title: Femtosecond to picosecond transient effects in WSe₂ observed by pump-probe angle-resolved photoemission spectroscopy

Journal Article · Wed Nov 22 00:00:00 EST 2017 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-017-16076-z· OSTI ID:1500108

Liu, Ro -Ya ^[1]; Ogawa, Yu ^[1]; Chen, Peng ^[2]; Ozawa, Kenichi ^[3]; Suzuki, Takeshi ^[1]; Okada, Masaru ^[1]; Someya, Takashi ^[1]; Ishida, Yukiaki ^[1];

^[1]; Shin, Shik ^[1]; Chiang, Tai -Chang ^[4]; Matsuda, Iwao ^[1]

The Univ. of Tokyo, Chiba (Japan)
Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
Tokyo Institute of Technology, Tokyo (Japan)
The Univ. of Tokyo, Chiba (Japan); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)

Time-dependent responses of materials to an ultrashort optical pulse carry valuable information about the electronic and lattice dynamics; this research area has been widely studied on novel two-dimensional materials such as graphene, transition metal dichalcogenides (TMDs) and topological insulators (TIs). We report herein a time-resolved and angle-resolved photoemission spectroscopy (TRARPES) study of WSe₂, a layered semiconductor of interest for valley electronics. The results for below-gap optical pumping reveal energy-gain and -loss Floquet replica valence bands that appear instantaneously in concert with the pump pulse. Energy shift, broadening, and complex intensity variation and oscillation at twice the phonon frequency for the valence bands are observed at time scales ranging from the femtosecond to the picosecond and beyond. Furthermore, the underlying physics is rich, including ponderomotive interaction, dressing of the electronic states, creation of coherent phonon pairs, and diffusion of charge carriers – effects operating at vastly different time domains.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-07ER46383

OSTI ID:: 1500108

Journal Information:: Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Ab Initio Simulation of Attosecond Transient Absorption Spectroscopy in Two-Dimensional Materials Sato, Shunsuke; Hübener, Hannes; De Giovannini, Umberto Applied Sciences, Vol. 8, Issue 10 https://doi.org/10.3390/app8101777	journal	September 2018

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Title: Femtosecond to picosecond transient effects in WSe2 observed by pump-probe angle-resolved photoemission spectroscopy

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