Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi 2Se 3 using time-resolved and angle-resolved photoemission spectroscopy

Y. H. Wang; D. Hsieh; E. J. Sie; H. Steinberg; D. R. Gardner; Y. S. Lee; P. Jarillo-Herrero; N. Gedik

doi:10.1103/PhysRevLett.109.127401

Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi ₂Se ₃ using time-resolved and angle-resolved photoemission spectroscopy

Y. H. Wang, D. Hsieh, E. J. Sie, H. Steinberg, D. R. Gardner, Y. S. Lee, P. Jarillo-Herrero, N. Gedik^*

^*Corresponding author for this work

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

234 Scopus citations

Abstract

We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator (TI) Bi ₂Se ₃ to study the ultrafast dynamics of surface and bulk electrons after photoexcitation. By analyzing the evolution of surface states and bulk band spectra, we obtain their electronic temperature and chemical potential relaxation dynamics separately. These dynamics reveal strong phonon-assisted surface-bulk coupling at high lattice temperature and total suppression of inelastic scattering between the surface and the bulk at low lattice temperature. In this low temperature regime, the unique cooling of Dirac fermions in TI by acoustic phonons is manifested through a power law dependence of the surface temperature decay rate on carrier density.

Original language	English
Article number	127401
Journal	Physical Review Letters
Volume	109
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.109.127401
State	Published - 20 Sep 2012
Externally published	Yes

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Wang, Y. H., Hsieh, D., Sie, E. J., Steinberg, H., Gardner, D. R., Lee, Y. S., Jarillo-Herrero, P., & Gedik, N. (2012). Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi ₂Se ₃ using time-resolved and angle-resolved photoemission spectroscopy. Physical Review Letters, 109(12), Article 127401. https://doi.org/10.1103/PhysRevLett.109.127401

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AU - Steinberg, H.

AU - Gardner, D. R.

AU - Lee, Y. S.

AU - Jarillo-Herrero, P.

AU - Gedik, N.

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N2 - We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator (TI) Bi 2Se 3 to study the ultrafast dynamics of surface and bulk electrons after photoexcitation. By analyzing the evolution of surface states and bulk band spectra, we obtain their electronic temperature and chemical potential relaxation dynamics separately. These dynamics reveal strong phonon-assisted surface-bulk coupling at high lattice temperature and total suppression of inelastic scattering between the surface and the bulk at low lattice temperature. In this low temperature regime, the unique cooling of Dirac fermions in TI by acoustic phonons is manifested through a power law dependence of the surface temperature decay rate on carrier density.

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Measurement of intrinsic dirac fermion cooling on the surface of the topological insulator Bi ₂Se ₃ using time-resolved and angle-resolved photoemission spectroscopy

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