Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi2Se3

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.

doi:10.1038/s41467-019-08559-6

Title: Ultrafast manipulation of topologically enhanced surface transport driven by mid-infrared and terahertz pulses in Bi₂Se₃

Journal Article · 05 February 2019 · Nature Communications

DOI: https://doi.org/10.1038/s41467-019-08559-6 · OSTI ID:1494932

Luo, L. ^[1];

^[1]; Liu, X. ^[2]; Liu, Z. ^[1];

^[1]; Cheng, D. ^[1]; Mootz, M. ^[3];

^[1];

^[1]; Wang, C. -Z. ^[1]; Ho, K. -M. ^[1]; Perakis, I. E. ^[3]; Dobrowolska, M. ^[2]; Furdyna, J. K. ^[2]; Wang, J. ^[1]

Ames Lab. and Iowa State Univ., Ames, IA (United States)
Univ. of Notre Dame, Notre Dame, IN (United States)
Univ. of Alabama at Birmingham, Birmingham, AL (United States)

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., γ_BS/γ_SS ~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.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Univ. of Alabama, Birmingham, AL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358; SC0019137

OSTI ID:: 1494932

Report Number(s):: IS-J--9887

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 10; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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