Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators

Standard

Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators. / Sumida, K.; Ishida, Y.; Zhu, S. et al.

In: Scientific Reports, Vol. 7, No. 1, 14080, 26.10.2017.

Research output: Contribution to journal › Article › peer-review

Harvard

Sumida, K, Ishida, Y, Zhu, S, Ye, M, Pertsova, A, Triola, C, Kokh, KA, Tereshchenko, OE, Balatsky, AV, Shin, S & Kimura, A 2017, 'Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators', Scientific Reports, vol. 7, no. 1, 14080. https://doi.org/10.1038/s41598-017-14308-w

APA

Sumida, K., Ishida, Y., Zhu, S., Ye, M., Pertsova, A., Triola, C., Kokh, K. A., Tereshchenko, O. E., Balatsky, A. V., Shin, S., & Kimura, A. (2017). Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators. Scientific Reports, 7(1), [14080]. https://doi.org/10.1038/s41598-017-14308-w

Vancouver

Sumida K, Ishida Y, Zhu S, Ye M, Pertsova A, Triola C et al. Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators. Scientific Reports. 2017 Oct 26;7(1):14080. doi: 10.1038/s41598-017-14308-w

Author

Sumida, K. ; Ishida, Y. ; Zhu, S. et al. / Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators. In: Scientific Reports. 2017 ; Vol. 7, No. 1.

BibTeX

@article{519ada2ae195415daee90b7abd46630b,

title = "Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators",

abstract = "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.",

keywords = "BI2TE3, DYNAMICS, SURFACE-STATES",

author = "K. Sumida and Y. Ishida and S. Zhu and M. Ye and A. Pertsova and C. Triola and Kokh, {K. A.} and Tereshchenko, {O. E.} and Balatsky, {A. V.} and S. Shin and A. Kimura",

note = "Publisher Copyright: {\textcopyright} 2017 The Author(s).",

year = "2017",

month = oct,

day = "26",

doi = "10.1038/s41598-017-14308-w",

language = "English",

volume = "7",

journal = "Scientific Reports",

issn = "2045-2322",

publisher = "Nature Publishing Group",

number = "1",

}

RIS

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.

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