Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators. / Sumida, K.; Ishida, Y.; Zhu, S. и др.
в: Scientific Reports, Том 7, № 1, 14080, 26.10.2017.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators
AU - Sumida, K.
AU - Ishida, Y.
AU - Zhu, S.
AU - Ye, M.
AU - Pertsova, A.
AU - Triola, C.
AU - Kokh, K. A.
AU - Tereshchenko, O. E.
AU - Balatsky, A. V.
AU - Shin, S.
AU - Kimura, A.
N1 - Publisher Copyright: © 2017 The Author(s).
PY - 2017/10/26
Y1 - 2017/10/26
N2 - Topological insulators (TIs) possess spin-polarized Dirac fermions on their surface but their unique properties are often masked by residual carriers in the bulk. Recently, (Sb1-x Bi x )2Te3 was introduced as a non-metallic TI whose carrier type can be tuned from n to p across the charge neutrality point. By using time- and angle-resolved photoemission spectroscopy, we investigate the ultrafast carrier dynamics in the series of (Sb1-x Bi x )2Te3. The Dirac electronic recovery of 10 ps at most in the bulk-metallic regime elongated to >400 ps when the charge neutrality point was approached. The prolonged nonequilibration is attributed to the closeness of the Fermi level to the Dirac point and to the high insulation of the bulk. We also discuss the feasibility of observing excitonic instability of (Sb1-x Bi x )2Te3.
AB - Topological insulators (TIs) possess spin-polarized Dirac fermions on their surface but their unique properties are often masked by residual carriers in the bulk. Recently, (Sb1-x Bi x )2Te3 was introduced as a non-metallic TI whose carrier type can be tuned from n to p across the charge neutrality point. By using time- and angle-resolved photoemission spectroscopy, we investigate the ultrafast carrier dynamics in the series of (Sb1-x Bi x )2Te3. The Dirac electronic recovery of 10 ps at most in the bulk-metallic regime elongated to >400 ps when the charge neutrality point was approached. The prolonged nonequilibration is attributed to the closeness of the Fermi level to the Dirac point and to the high insulation of the bulk. We also discuss the feasibility of observing excitonic instability of (Sb1-x Bi x )2Te3.
KW - BI2TE3
KW - DYNAMICS
KW - SURFACE-STATES
UR - http://www.scopus.com/inward/record.url?scp=85032510486&partnerID=8YFLogxK
U2 - 10.1038/s41598-017-14308-w
DO - 10.1038/s41598-017-14308-w
M3 - Article
C2 - 29074864
AN - SCOPUS:85032510486
VL - 7
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 14080
ER -
ID: 9021620