Unusual temperature evolution of the band structure of Bi(111) studied by angle-resolved photoemission spectroscopy and density functional theory

Takafumi Sato, Keiko Yamada, Takao Kosaka, Seigo Souma, Kunihiko Yamauchi, Katsuaki Sugawara, Tamio Oguchi, Takashi Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

We have performed angle-resolved photoemission spectroscopy of Bi(111) thin films grown on Si(111), and investigated the evolution of band structure with temperature. We revealed an unexpectedly large temperature variation of the energy dispersion for the Rashba-split surface state and the quantum-well states, as seen in the highly momentum-dependent energy shift as large as 0.1 eV. A comparison of the band dispersion between experiment and first-principles band-structure calculations suggests that the interlayer spacing at the topmost Bi bilayer expands upon temperature increase. The present study provides a pathway for investigating the interplay between lattice and electronic states through the temperature dependence of band structure.

Original languageEnglish
Article number085112
JournalPhysical Review B
Volume102
Issue number8
DOIs
Publication statusPublished - 2020 Aug 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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