Tunable two-dimensional electron gas at the surface of thermoelectric material In4Se3

K. Fukutani, T. Sato, P. V. Galiy, K. Sugawara, T. Takahashi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We report the discovery of two-dimensional electron gas (2DEG) at the surface of thermoelectric material In4Se3 by angle-resolved photoemission spectroscopy. The observed 2DEG exhibits a nearly isotropic band dispersion with a considerably small effective mass of m∗=0.16 m0, and its carrier density shows a significant temperature dependence, leading to unconventional metal-semiconductor transition at the surface. The observed wide-range thermal tunability of 2DEG in In4Se3 gives rise to additional degrees of freedom to better control the surface carriers of semiconductors.

Original languageEnglish
Article number205156
JournalPhysical Review B
Volume93
Issue number20
DOIs
Publication statusPublished - 2016 May 31

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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