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Tracking Ultrafast Photocurrents in the Weyl Semimetal TaAs Using THz Emission Spectroscopy

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [1];  [1];  [1];  [1];  [5];  [1];  [4];  [3];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Groningen (Netherlands). Zernike Inst. for Advanced Materials
  3. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
  4. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy. California NanoSystems Inst.
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Nanjing Univ. (China). School of Physics

We investigate here polarization-dependent ultrafast photocurrents in the Weyl semimetal TaAs using terahertz (THz) emission spectroscopy. Our results reveal that highly directional, transient photocurrents are generated along the noncentrosymmetric c axis regardless of incident light polarization, while helicity-dependent photocurrents are excited within the ab plane. This is consistent with earlier static photocurrent experiments, and demonstrates on the basis of both the physical constraints imposed by symmetry and the temporal dynamics intrinsic to current generation and decay that optically induced photocurrents in TaAs are inherent to the underlying crystal symmetry of the transition metal monopnictide family of Weyl semimetals.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Los Angeles, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
89233218CNA000001; AC02-07CH11358; SC0011978
OSTI ID:
1542840
Alternate ID(s):
OSTI ID: 1512837
Report Number(s):
LA-UR--18-26789
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 122; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Circular photogalvanic spectroscopy of Rashba splitting in 2D hybrid organic–inorganic perovskite multiple quantum wells journal January 2020
Chiral terahertz wave emission from the Weyl semimetal TaAs journal February 2020
Helicity-dependent terahertz photocurrent and phonon dynamics in hybrid metal halide perovskites journal December 2019
Chiral terahertz wave emission from the Weyl semimetal TaAs text January 2019