Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.116801
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Funding
- Basic Energy Sciences, U.S. Department of Energy [DE-FG-02-05ER46200, AC03-76SF00098, DE-FG02-07ER46352]
- Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4547]
- LANL LDRD program
- KAKENHI [26800165]
- MEXT, Photon and Quantum Basic Research Coordinated Development Program
- NSF [DMR 1206513]
- NSF through the PFC at JQI
- Conacyt
- NERSC [DE-AC02-05CH11231]
- DOE-BES [DESC0001911]
- Australian Research Council
- Simons Foundation
- NSF IR/D program
- Direct For Mathematical & Physical Scien
- Division Of Physics [1430094] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [26800165] Funding Source: KAKEN
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The interaction between light and novel two-dimensional electronic states holds promise to realize new fundamental physics and optical devices. Here, we use pump-probe photoemission spectroscopy to study the optically excited Dirac surface states in the bulk-insulating topological insulator Bi2Te2 Se and reveal optical properties that are in sharp contrast to those of bulk-metallic topological insulators. We observe a gigantic optical lifetime exceeding 4 mu s (1 mu s = 10(-6) s) for the surface states in Bi2Te2 Se, whereas the lifetime in most topological insulators, such as Bi2Se3, has been limited to a few picoseconds (1 ps = 10(-12) s). Moreover, we discover a surface photovoltage, a shift of the chemical potential of the Dirac surface states, as large as 100 mV. Our results demonstrate a rare platform to study charge excitation and relaxation in energy and momentum space in a two-dimensional system.
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