Nonequilibrium electronic and phonon dynamics of Cu0.17Bi2Se3 investigated by core-level and valence-band time-resolved photoemission spectroscopy

T. Yamamoto, Y. Ishida, R. Yoshida, M. Okawa, K. Okazaki, T. Kanai, A. Kikkawa, Y. Taguchi, T. Kiss, K. Ishizaka, N. Ishii, J. Itatani, S. Watanabe, Y. Tokura, T. Saitoh, S. Shin

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2 Citations (Scopus)

Abstract

We have performed time-resolved (TR) core-level and valence-band angle-resolved (AR) photoemission spectroscopy (PES) to investigate ultrafast dynamics of an electron-doped topological insulator Cu0.17Bi2Se3. The Bi 5d5/2 line was composed of a single peak and exhibited broadening upon both heating and pumping, which we interpreted as a change of phonon temperature (Tp), in the surface region. The electronic dynamics and electron temperature (Te), on the other hand, were determined with near-EF TRARPES. The transient temperature deduced from core-level TRPES shows a similar behavior with Te deduced from near-EF TRARPES. This similar behavior of Tp and Te can be reproduced not by a simple two-temperature model but by a modified one, although we cannot exclude a possibility that core-level broadening also reflects Te.

Original languageEnglish
Article number121106
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number12
DOIs
Publication statusPublished - 2015 Sep 10
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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