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Title: Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi 2Se 3

Abstract

Topology-protected surface transport of ultimate thinness in three-dimensional topological insulators (TIs) is breaking new ground in quantum science and technology. Yet a challenge remains on how to disentangle and selectively control surface helical spin transport from the bulk contribution. Here we use the mid-infrared and terahertz (THz) photoexcitation of exclusive intraband transitions to enable ultrafast manipulation of surface THz conductivity in Bi 2Se 3. The unique, transient electronic state is characterized by frequency-dependent carrier relaxations that directly distinguish the faster surface channel than the bulk with no complication from interband excitations or need for reduced bulk doping. We determine the topological enhancement ratio between bulk and surface scattering rates, i.e., γ BSSS ~3.80 in equilibrium. As a result, the ultra-broadband, wavelength-selective pumping may be applied to emerging topological semimetals for separation and control of the protected transport connected with the Weyl nodes from other bulk bands.

Authors:
 [1]; ORCiD logo [1];  [2];  [1]; ORCiD logo [1];  [1];  [3]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [3];  [2];  [2];  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
  2. Univ. of Notre Dame, Notre Dame, IN (United States)
  3. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1494932
Report Number(s):
IS-J-9887
Journal ID: ISSN 2041-1723
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Luo, L., Yang, X., Liu, X., Liu, Z., Vaswani, C., Cheng, D., Mootz, M., Zhao, X., Yao, Y., Wang, C. -Z., Ho, K. -M., Perakis, I. E., Dobrowolska, M., Furdyna, J. K., and Wang, J. Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi2Se3. United States: N. p., 2019. Web. doi:10.1038/s41467-019-08559-6.
Luo, L., Yang, X., Liu, X., Liu, Z., Vaswani, C., Cheng, D., Mootz, M., Zhao, X., Yao, Y., Wang, C. -Z., Ho, K. -M., Perakis, I. E., Dobrowolska, M., Furdyna, J. K., & Wang, J. Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi2Se3. United States. doi:10.1038/s41467-019-08559-6.
Luo, L., Yang, X., Liu, X., Liu, Z., Vaswani, C., Cheng, D., Mootz, M., Zhao, X., Yao, Y., Wang, C. -Z., Ho, K. -M., Perakis, I. E., Dobrowolska, M., Furdyna, J. K., and Wang, J. Tue . "Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi2Se3". United States. doi:10.1038/s41467-019-08559-6. https://www.osti.gov/servlets/purl/1494932.
@article{osti_1494932,
title = {Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi2Se3},
author = {Luo, L. and Yang, X. and Liu, X. and Liu, Z. and Vaswani, C. and Cheng, D. and Mootz, M. and Zhao, X. and Yao, Y. and Wang, C. -Z. and Ho, K. -M. and Perakis, I. E. and Dobrowolska, M. and Furdyna, J. K. and Wang, J.},
abstractNote = {Topology-protected surface transport of ultimate thinness in three-dimensional topological insulators (TIs) is breaking new ground in quantum science and technology. Yet a challenge remains on how to disentangle and selectively control surface helical spin transport from the bulk contribution. Here we use the mid-infrared and terahertz (THz) photoexcitation of exclusive intraband transitions to enable ultrafast manipulation of surface THz conductivity in Bi2Se3. The unique, transient electronic state is characterized by frequency-dependent carrier relaxations that directly distinguish the faster surface channel than the bulk with no complication from interband excitations or need for reduced bulk doping. We determine the topological enhancement ratio between bulk and surface scattering rates, i.e., γBS/γSS ~3.80 in equilibrium. As a result, the ultra-broadband, wavelength-selective pumping may be applied to emerging topological semimetals for separation and control of the protected transport connected with the Weyl nodes from other bulk bands.},
doi = {10.1038/s41467-019-08559-6},
journal = {Nature Communications},
number = 1,
volume = 10,
place = {United States},
year = {2019},
month = {2}
}

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Works referenced in this record:

Z2 Topological Order and the Quantum Spin Hall Effect
journal, September 2005


Colloquium: Topological insulators
journal, November 2010


Quantum Oscillations and Hall Anomaly of Surface States in the Topological Insulator Bi2Te3
journal, July 2010


Topological insulators in Bi2Se3, Bi2Te3 and Sb2Te3 with a single Dirac cone on the surface
journal, May 2009

  • Zhang, Haijun; Liu, Chao-Xing; Qi, Xiao-Liang
  • Nature Physics, Vol. 5, Issue 6, p. 438-442
  • DOI: 10.1038/nphys1270

A topological Dirac insulator in a quantum spin Hall phase
journal, April 2008

  • Hsieh, D.; Qian, D.; Wray, L.
  • Nature, Vol. 452, Issue 7190, p. 970-974
  • DOI: 10.1038/nature06843

The quantum spin Hall effect and topological insulators
journal, January 2010

  • Qi, Xiao-Liang; Zhang, Shou-Cheng
  • Physics Today, Vol. 63, Issue 1, p. 33-38
  • DOI: 10.1063/1.3293411

Topological invariants of time-reversal-invariant band structures
journal, March 2007