Terahertz dynamics of topological insulator Bi2Se3: Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering

Sangwan Sim, Matthew Brahlek, Nikesh Koirala, Soonyoung Cha, Seongshik Oh, Hyunyong Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present ultrafast terahertz scattering dynamics in topological insulator Bi2Se3: thin films. Upon photoexcitation, the surface-scattering rate is increased, resulting in decrease of conductance. At high temperature, however, the photo-generated electrons suppress the surface scattering.

Original languageEnglish (US)
Title of host publicationCLEO
Subtitle of host publicationQELS_Fundamental Science, CLEO_QELS 2014
PublisherOptical Society of American (OSA)
ISBN (Print)9781557529992
StatePublished - Jan 1 2014
EventCLEO: QELS_Fundamental Science, CLEO_QELS 2014 - San Jose, CA, United States
Duration: Jun 8 2014Jun 13 2014

Publication series

NameOptics InfoBase Conference Papers
ISSN (Electronic)2162-2701

Other

OtherCLEO: QELS_Fundamental Science, CLEO_QELS 2014
CountryUnited States
CitySan Jose, CA
Period6/8/146/13/14

Fingerprint

Surface scattering
Hot electrons
Photoexcitation
photoexcitation
insulators
scattering
electrons
Scattering
Thin films
Electrons
thin films
Temperature

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Atomic and Molecular Physics, and Optics

Cite this

Sim, S., Brahlek, M., Koirala, N., Cha, S., Oh, S., & Choi, H. (2014). Terahertz dynamics of topological insulator Bi2Se3: Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering. In CLEO: QELS_Fundamental Science, CLEO_QELS 2014 (Optics InfoBase Conference Papers). Optical Society of American (OSA).
Sim, Sangwan ; Brahlek, Matthew ; Koirala, Nikesh ; Cha, Soonyoung ; Oh, Seongshik ; Choi, Hyunyong. / Terahertz dynamics of topological insulator Bi2Se3 : Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering. CLEO: QELS_Fundamental Science, CLEO_QELS 2014. Optical Society of American (OSA), 2014. (Optics InfoBase Conference Papers).
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Sim, S, Brahlek, M, Koirala, N, Cha, S, Oh, S & Choi, H 2014, Terahertz dynamics of topological insulator Bi2Se3: Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering. in CLEO: QELS_Fundamental Science, CLEO_QELS 2014. Optics InfoBase Conference Papers, Optical Society of American (OSA), CLEO: QELS_Fundamental Science, CLEO_QELS 2014, San Jose, CA, United States, 6/8/14.

Terahertz dynamics of topological insulator Bi2Se3 : Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering. / Sim, Sangwan; Brahlek, Matthew; Koirala, Nikesh; Cha, Soonyoung; Oh, Seongshik; Choi, Hyunyong.

CLEO: QELS_Fundamental Science, CLEO_QELS 2014. Optical Society of American (OSA), 2014. (Optics InfoBase Conference Papers).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Oh, Seongshik

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Sim S, Brahlek M, Koirala N, Cha S, Oh S, Choi H. Terahertz dynamics of topological insulator Bi2Se3: Ultrafast photoexcitation suppresses hot-Dirac electron surface scattering. In CLEO: QELS_Fundamental Science, CLEO_QELS 2014. Optical Society of American (OSA). 2014. (Optics InfoBase Conference Papers).