Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.127401
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Funding
- Department of Energy Office of Basic Energy Sciences [DE-FG02-08ER46521, DE-SC0006423]
- Army Research Office (ARO-DURIP) [W911NF-09-1-0170]
- MRSEC Program of the National Science Foundation [DMR-0819762]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE. SC0006418]
- Packard Fellowship
- U.S. Department of Energy (DOE) [DE-SC0006418, DE-SC0006423] Funding Source: U.S. Department of Energy (DOE)
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We perform time- and angle-resolved photoemission spectroscopy of a prototypical topological insulator (TI) Bi2Se3 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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