TY - JOUR
T1 - Nonequilibrium electronic and phonon dynamics of Cu0.17Bi2Se3 investigated by core-level and valence-band time-resolved photoemission spectroscopy
AU - Yamamoto, T.
AU - Ishida, Y.
AU - Yoshida, R.
AU - Okawa, M.
AU - Okazaki, K.
AU - Kanai, T.
AU - Kikkawa, A.
AU - Taguchi, Y.
AU - Kiss, T.
AU - Ishizaka, K.
AU - Ishii, N.
AU - Itatani, J.
AU - Watanabe, S.
AU - Tokura, Y.
AU - Saitoh, T.
AU - Shin, S.
N1 - Publisher Copyright:
© 2015 American Physical Society.
PY - 2015/9/10
Y1 - 2015/9/10
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.92.121106
DO - 10.1103/PhysRevB.92.121106
M3 - Article
AN - SCOPUS:84942424791
SN - 1098-0121
VL - 92
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 12
M1 - 121106
ER -