Enhanced photovoltage on the surface of topological insulator via optical aging

Tomoki Yoshikawa, Yukiaki Ishida, Kazuki Sumida, Jiahua Chen, Konstantin A. Kokh, Oleg E. Tereshchenko, Shik Shin, Akio Kimura

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The efficient generation of spin-polarized current is one of the keys to realizing spintronic devices with a low power consumption. Topological insulators are strong candidates for this purpose. A surface photovoltaic effect can be utilized on the surface of a topological insulator, where a surface spin-polarized current can flow upon illumination. Here, we used time- and angle-resolved photoelectron spectroscopy on the surface of Bi2Te3 to demonstrate that the magnitude of the surface photovoltage is almost doubled in optically aged samples, i.e., samples whose surface has been exposed to intense infrared light illumination. Our findings pave the way for optical control of the spin-polarized current by utilizing topological insulators.

Original languageEnglish
Article number192104
Number of pages4
JournalApplied Physics Letters
Volume112
Issue number19
DOIs
Publication statusPublished - 7 May 2018

Keywords

  • EXPERIMENTAL REALIZATION
  • DIODES

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