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

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

Department of Electrical and Electronic Engineering

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

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 surfacescattering.

Original language	English
Publication status	Published - 2014
Event	2014 Conference on Lasers and Electro-Optics, CLEO 2014 - San Jose, United States Duration: 2014 Jun 8 → 2014 Jun 13

Other

Other	2014 Conference on Lasers and Electro-Optics, CLEO 2014
Country/Territory	United States
City	San Jose
Period	14/6/8 → 14/6/13

Bibliographical note

Publisher Copyright:
© 2014 Optical Society of America.

All Science Journal Classification (ASJC) codes

Electrical and Electronic Engineering
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials

Cite this

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

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 surfacescattering.",

author = "Sangwan Sim and Matthew Brahlek and Nikesh Koirala and Soonyoung Cha and Seongshik Oh and Hyunyong Choi",

note = "Publisher Copyright: {\textcopyright} 2014 Optical Society of America.; 2014 Conference on Lasers and Electro-Optics, CLEO 2014 ; Conference date: 08-06-2014 Through 13-06-2014",

year = "2014",

language = "English",

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T1 - Terahertz dynamics of topological insulator Bi2Se3

T2 - 2014 Conference on Lasers and Electro-Optics, CLEO 2014

AU - Sim, Sangwan

AU - Brahlek, Matthew

AU - Koirala, Nikesh

AU - Cha, Soonyoung

AU - Oh, Seongshik

AU - Choi, Hyunyong

PY - 2014

Y1 - 2014

N2 - 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 surfacescattering.

AB - 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 surfacescattering.

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AN - SCOPUS:84944704904

Y2 - 8 June 2014 through 13 June 2014

ER -