Evan J. Philip (Stony Brook University)

When:
March 8, 2019 @ 1:30 pm – 2:30 pm

Chiral Photocurrents and Terahertz Emission in Dirac and Weyl Materials

Abstract:
Recently, chiral photocurrents have been observed in Weyl materials. I will discuss a new mechanism we proposed for photocurrents in Dirac and Weyl materials in the presence of magnetic fields that, unlike previously proposed effects, does not depend on any asymmetry of the crystal. This Chiral Magnetic Photocurrent would be an independent probe of the chiral anomaly. I will also discuss an observation of terahertz emission in the Weyl material TaAs with tunable ellipticity due to chiral photocurrents induced by an ultrafast near infrared laser.
References:
arXiv:1810.02399 [cond-mat.mes-hall]
arXiv:1901.00986 [cond-mat.mtrl-sci]

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