Ultrafast bipolar conductivity driven by intense single-cycle terahertz pulses in a topological insulator Bi2Se3

Luo, L.; Yang, X.; Vaswani, C.; Liu, X.; Perakis, I. E.; Dobrowolska, M.; Furdyna, J. K.; Wang, J.

doi:10.1088/2040-8986/ac0316

Title: Ultrafast bipolar conductivity driven by intense single-cycle terahertz pulses in a topological insulator Bi₂Se₃

Journal Article · Thu Sep 16 00:00:00 EDT 2021 · Journal of Optics

DOI:https://doi.org/10.1088/2040-8986/ac0316· OSTI ID:1827102

Luo, L. ^[1];

^[1]; Vaswani, C. ^[1]; Liu, X. ^[2]; Perakis, I. E. ^[3]; Dobrowolska, M. ^[2]; Furdyna, J. K. ^[2];

^[1]

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

We present the measurement of ultrafast terahertz (THz) conductivity of a 50 nm thick topological insulator Bi₂Se₃ at low temperature 5 K by using a THz pump and THz probe spectroscopy scheme. Here, the THz conductivity driven by a single-cycle intense THz pump exhibits a bipolar lineshape and frequency-dependent relaxation dynamics due to the separated surface and bulk charge carriers with distinctly different scattering rates and relaxation times. We also demonstrate THz pump field-dependent excitation of the surface and bulk spectral weights, which suggests one of the optimal THz excitation conditions for generating the most charge carriers from the topology-protected surface state relative to the bulk. This also allows THz control of surface and bulk transport channels in a selective way.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES)

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

OSTI ID:: 1827102

Alternate ID(s):: OSTI ID: 1971732

Report Number(s):: IS-J-10,602; DEAC02- 07CH11358

Journal Information:: Journal of Optics, Vol. 23, Issue 10; ISSN 2040-8978

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Ultrafast bipolar conductivity driven by intense single-cycle terahertz pulses in a topological insulator Bi2Se3

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