Terahertz nonlinear optical response from transition metal monopnictide Weyl semimetal TaAs
ORAL
Abstract
Weyl semimetals are a newly discovered class of materials whose low-energy excitations are massless chiral fermions known as Weyl fermions. It has recently been shown that the transition metal monopnictide (TMMP) family of Weyl semimetals has a giant anisotropic nonlinear optical response, [arXiv:1609.04894] as revealed by optical second harmonic generation. We report here the nonlinear response of the TMMP TaAs through optical rectification of amplified femtosecond laser radiation, a phenomenon related to photogalvanic and nonlinear Hall effects. The emitted rectified radiation is in the Terahertz energy range of around 4 meV and allows us to study electron dynamics close to the Fermi surface.
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Authors
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Shreyas Patankar
University of California, Berkeley
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Liang Wu
University of California, Berkeley, Univ of California - Berkeley
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Arielle Little
University of California, Berkeley, Univ of California - Berkeley
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Eric Thewalt
University of California, Berkeley, University of California, Berkeley and Lawrence Berkeley National Laboratory
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Dylan Rees
University of California, Berkeley
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Nityan Nair
University of California, Berkeley
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James Analytis
University of California, Berkeley, Department of Physics, University of California, Berkeley, and Lawrence Berkeley National Laboratory, UC Berkeley
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Joseph Orenstein
University of California, Berkeley