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Title: Gigantic Surface Lifetime of an Intrinsic Topological Insulator

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [5];  [2];  [2];  [2];  [2];  [6];  [7];  [3];  [8];  [9]
  1. Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics
  3. Univ. of Tokyo (Japan). Inst. for Solid State Physics (ISSP)
  4. Princeton Univ., NJ (United States). Dept. of Chemistry; Peking Univ., Beijing (China). International Center for Quantum Materials
  5. Univ. of California, Berkeley, CA (United States). Dept. of Physics
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  7. Univ. of Maryland, College Park, MD (United States). Joint Quantum Inst. and Condensed Matter Theory Center, Dept. of Physics; Monash Univ., Melbourne, VIC (Australia). School of Physics
  8. Princeton Univ., NJ (United States). Dept. of Chemistry
  9. Princeton Univ., NJ (United States). Joseph Henry Lab., Dept. of Physics; Princeton Univ., NJ (United States). Princeton Center for Complex Materials

We report that 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 Bi2Te2Se and reveal optical properties that are in sharp contrast to those of bulk-metallic topological insulators. We observe a gigantic optical lifetime exceeding 4 μs (1 μs=10$${-}$$6 s) for the surface states in Bi2Te2Se, 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. Lastly, our results demonstrate a rare platform to study charge excitation and relaxation in energy and momentum space in a two-dimensional system.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Australian Research Council; Simons Foundation
Grant/Contract Number:
AC52-06NA25396; FG-02-05ER46200; AC03-76SF00098; FG02-07ER46352; SC0001911; AC02-05CH11231; GBMF4547; 26800165; DMR 1206513
OSTI ID:
1334115
Alternate ID(s):
OSTI ID: 1214746
Report Number(s):
LA-UR-15-26947; PRLTAO
Journal Information:
Physical Review Letters, Vol. 115, Issue 11; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Cited By (19)

Dynamically Induced Excitonic Instability in Pumped Dirac Materials journal December 2019
Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd journal November 2016
Spin Hall photoconductance in a three-dimensional topological insulator at room temperature journal January 2018
Prediction of a topological p + ip excitonic insulator with parity anomaly journal January 2019
Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators journal October 2017
Laser-induced persistent photovoltage on the surface of a ternary topological insulator at room temperature journal April 2017
Extreme ultraviolet time- and angle-resolved photoemission setup with 21.5 meV resolution using high-order harmonic generation from a turn-key Yb:KGW amplifier journal January 2020
Size constraints on a Majorana beam-splitter interferometer: Majorana coupling and surface-bulk scattering journal March 2018
Signatures of in-plane and out-of-plane magnetization generated by synchrotron radiation in magnetically doped and pristine topological insulators journal June 2018
Ionic and electronic properties of the topological insulator Bi 2 Te 2 Se investigated via β -detected nuclear magnetic relaxation and resonance of Li 8 journal March 2019
Surface State Dynamics of Topological Insulators Investigated by Femtosecond Time- and Angle-Resolved Photoemission Spectroscopy journal April 2018
Prolonged duration of nonequilibrated Dirac fermions in neutral topological insulators text January 2017
Observation of Dirac-Like Semi-Metallic Phase in NdSb text January 2016
Shift charge and spin photocurrents in Dirac surface states of topological insulator text January 2016
Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd text January 2016
Excitonic instability in optically-pumped three-dimensional Dirac materials text January 2017
Size Constraints on Majorana Beamsplitter Interferometer: Majorana Coupling and Surface-Bulk Scattering text January 2017
Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator text January 2018
Extreme Ultraviolet Time- and Angle-Resolved Photoemission Spectroscopy with 21.5 meV Resolution using High-Order Harmonic Generation from a Turn-Key Yb:KGW Amplifier text January 2019