Cited by 470Topological Materials and Phenomena2D Materials and ApplicationsCrystal Structures and Properties

Giant anisotropic nonlinear optical response in transition metal monopnictide Weyl semimetals

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Wu, Liang, Patankar, S., Morimoto, T., Nair, N. L., Thewalt, E., Little, A., Analytis, J. G., Moore, J. E. +1 more·2017·Nature Physics

Abstract

An optical second-harmonic generation study of a series of transition metal monopnictide Weyl semimetals reveals a giant, anisotropic nonlinear optical response in these systems. Although Weyl fermions have proven elusive in high-energy physics, their existence as emergent quasiparticles has been predicted in certain crystalline solids in which either inversion or time-reversal symmetry is broken1,2,3,4. Recently they have been observed in transition metal monopnictides (TMMPs) such as TaAs, a class of noncentrosymmetric materials that heretofore received only limited attention5,6,7. The question that arises now is whether these materials will exhibit novel, enhanced, or technologically applicable electronic properties. The TMMPs are polar metals, a rare subset of inversion-breaking crystals that would allow spontaneous polarization, were it not screened by conduction electrons8,9,10. Despite the absence of spontaneous polarization, polar metals can exhibit other signatures of inversion-symmetry breaking, most notably second-order nonlinear optical polarizability, χ(2), leading to phenomena such as optical rectification and second-harmonic generation (SHG). Here we report measurements of SHG that reveal a giant, anisotropic χ(2) in the TMMPs TaAs, TaP and NbAs. With the fundamental and second-harmonic fields oriented parallel to the polar axis, the value of χ(2) is larger by almost one order of magnitude than its value in the archetypal electro-optic materials GaAs11 and ZnTe12, and in fact larger than reported in any crystal to date.

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  1. [3]3. Weng, H., Fang, C., Fang, Z., Bernevig, B. A. & Dai, X. Weyl semimetal phase in noncentrosymmetric transitionmetal monophosphides. Phys. Rev. X 5, 011029 (2015).
  2. [24]24. Miller, R. C. Optical harmonic generation in single crystal BaTiO 3 . Phys. Rev. 134, A1313 (1964).
  3. [33]33. Bloembergen, N. & Pershan, P. Light waves at the boundary of nonlinear media. Phys. Rev. 128, 606 (1962).

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Authors
Wu, L., Patankar, S., Morimoto, T., Nair, N. L., Thewalt, E., Little, A., Analytis, J. G., Moore, J. E., & Orenstein, J.
Affiliations
  • Lawrence Berkeley National Laboratory (US)
  • University of California, Berkeley (US)
Corresponding author
  • Wu, Liang
  • Orenstein, J.
Venue
Nature Physics
Published
2016-12-05
Volume
13
Issue
4
Pages
350-355
ISSN
  • 1745-2473 (ISSN-L)
  • 1745-2481
OpenAlex
W2523595512
Cited by
468
References
38
Citations by year
2026: 38 · 2025: 50 · 2024: 43 · 2023: 72 · 2022: 60 · 2021: 66 · 2020: 48 · 2019: 48 · 2018: 28 · 2017: 13 · 2016: 1
FWCI
14.18
Type
journal article
Language
en
Open access
Locations
  • Nature Physics (publishedVersion)
  • arXiv (Cornell University) (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • arXiv (Cornell University)
  • Bulletin of the American Physical Society
Funders
  • U.S. Department of Energy (-AC02-05CH11231, Contract No. DE-AC02-05-CH11231, 05CH11231, No. DE-AC02-05-CH11231, DE AC02 05CH11231, DE-AC02-)
  • Simons Foundation
  • Gordon and Betty Moore Foundation (GBMF4374, GBMF4307, GBMF4537)
  • Office of Science (No. DE-AC02- 05-CH11231, DEAC02–05CH11231, AC02-05CH11231, DE-AC02, Contract No. DE-AC02-05CH11231)
  • Office of Naval Research (DE-AC02-05CH11231, N00014)
  • Basic Energy Sciences (DE-AC02, Contract No. DE-AC02-05-CH11231, DE-AC02-05CH11231., No. DE-AC02-05-CH11231, AC02–05CH11231)
  • Lawrence Berkeley National Laboratory (AC02‐05CH11231, DE-AC02-05CH11231, No. DE-AC02-05CH11231, Contract No. DE-AC02-05CH11231, 05CH11231)
Topics
  • Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
  • Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
  • Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Crystal Structures and Properties
Keywords
Weyl semimetals, second harmonic generation, second-order nonlinear susceptibility, polar metals, inversion symmetry breaking, thoracic aortic aneurysm, TAP, NBAS, Weyl fermions, noncentrosymmetric materials

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