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Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se. / Munisa, Nurmamat; Krasovskii, E. E.; Ishida, Y. et al.

In: Physical Review B, Vol. 97, No. 11, 115303, 08.03.2018.

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

Harvard

Munisa, N, Krasovskii, EE, Ishida, Y, Sumida, K, Chen, J, Yoshikawa, T, Chulkov, EV, Kokh, KA, Tereshchenko, OE, Shin, S & Kimura, A 2018, 'Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se', Physical Review B, vol. 97, no. 11, 115303. https://doi.org/10.1103/PhysRevB.97.115303

APA

Munisa, N., Krasovskii, E. E., Ishida, Y., Sumida, K., Chen, J., Yoshikawa, T., Chulkov, E. V., Kokh, K. A., Tereshchenko, O. E., Shin, S., & Kimura, A. (2018). Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se. Physical Review B, 97(11), [115303]. https://doi.org/10.1103/PhysRevB.97.115303

Vancouver

Munisa N, Krasovskii EE, Ishida Y, Sumida K, Chen J, Yoshikawa T et al. Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se. Physical Review B. 2018 Mar 8;97(11):115303. doi: 10.1103/PhysRevB.97.115303

Author

Munisa, Nurmamat ; Krasovskii, E. E. ; Ishida, Y. et al. / Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se. In: Physical Review B. 2018 ; Vol. 97, No. 11.

BibTeX

@article{e0b9124e236447cdb8ad85b7d361a626,
title = "Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se",
abstract = "Electronic structure and electron dynamics in the ternary topological insulator Bi2Te2Se are studied with time- and angle-resolved photoemission spectroscopy using optical pumping. An unoccupied surface resonance split off from the bulk conduction band previously indirectly observed in scanning tunneling measurements is spectroscopically identified. Furthermore, an unoccupied topological surface state (TSS) is found, which is serendipitously located at about 1.5 eV above the occupied TSS, thereby facilitating direct optical transitions between the two surface states at ω=1.5eV in an n-type topological insulator. An appreciable nonequilibrium population of the bottom of the bulk conduction band is observed for longer than 15 ps after the pump pulse. This leads to a long recovery time of the lower TSS, which is constantly populated by the electrons coming from the bulk conduction band. Our results demonstrate Bi2Te2Se to be an ideal platform for designing future optoelectronic devices based on topological insulators.",
keywords = "TOPOLOGICAL INSULATOR, ELECTRON DYNAMICS",
author = "Nurmamat Munisa and Krasovskii, {E. E.} and Y. Ishida and K. Sumida and Jiahua Chen and T. Yoshikawa and Chulkov, {E. V.} and Kokh, {K. A.} and Tereshchenko, {O. E.} and S. Shin and Akio Kimura",
year = "2018",
month = mar,
day = "8",
doi = "10.1103/PhysRevB.97.115303",
language = "English",
volume = "97",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "11",

}

RIS

TY - JOUR

T1 - Ultrafast dynamics of an unoccupied surface resonance state in B i2 T e2Se

AU - Munisa, Nurmamat

AU - Krasovskii, E. E.

AU - Ishida, Y.

AU - Sumida, K.

AU - Chen, Jiahua

AU - Yoshikawa, T.

AU - Chulkov, E. V.

AU - Kokh, K. A.

AU - Tereshchenko, O. E.

AU - Shin, S.

AU - Kimura, Akio

PY - 2018/3/8

Y1 - 2018/3/8

N2 - Electronic structure and electron dynamics in the ternary topological insulator Bi2Te2Se are studied with time- and angle-resolved photoemission spectroscopy using optical pumping. An unoccupied surface resonance split off from the bulk conduction band previously indirectly observed in scanning tunneling measurements is spectroscopically identified. Furthermore, an unoccupied topological surface state (TSS) is found, which is serendipitously located at about 1.5 eV above the occupied TSS, thereby facilitating direct optical transitions between the two surface states at ω=1.5eV in an n-type topological insulator. An appreciable nonequilibrium population of the bottom of the bulk conduction band is observed for longer than 15 ps after the pump pulse. This leads to a long recovery time of the lower TSS, which is constantly populated by the electrons coming from the bulk conduction band. Our results demonstrate Bi2Te2Se to be an ideal platform for designing future optoelectronic devices based on topological insulators.

AB - Electronic structure and electron dynamics in the ternary topological insulator Bi2Te2Se are studied with time- and angle-resolved photoemission spectroscopy using optical pumping. An unoccupied surface resonance split off from the bulk conduction band previously indirectly observed in scanning tunneling measurements is spectroscopically identified. Furthermore, an unoccupied topological surface state (TSS) is found, which is serendipitously located at about 1.5 eV above the occupied TSS, thereby facilitating direct optical transitions between the two surface states at ω=1.5eV in an n-type topological insulator. An appreciable nonequilibrium population of the bottom of the bulk conduction band is observed for longer than 15 ps after the pump pulse. This leads to a long recovery time of the lower TSS, which is constantly populated by the electrons coming from the bulk conduction band. Our results demonstrate Bi2Te2Se to be an ideal platform for designing future optoelectronic devices based on topological insulators.

KW - TOPOLOGICAL INSULATOR

KW - ELECTRON DYNAMICS

UR - http://www.scopus.com/inward/record.url?scp=85043982503&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.97.115303

DO - 10.1103/PhysRevB.97.115303

M3 - Article

AN - SCOPUS:85043982503

VL - 97

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 11

M1 - 115303

ER -

ID: 12028014