Nonlinear Time Domain Spectroscopy Near a Band Inversion

E. J. Mele; Zachariah Addison

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Nonlinear Time Domain Spectroscopy Near a Band Inversion

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arxiv 2005.11550 v2 pith:LOWNKV3L submitted 2020-05-23 cond-mat.mes-hall

Zachariah Addison , E. J. Mele This is my paper · ORCID

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keywords nearbandinversionnonlinearresponsetimedomainfield

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We develop a theory for the nonlinear time domain response of a Weyl semimetal driven by an ultrafast optical pulse. At quadratic order in the driving field we find that the response near a band inversion transition contains a coherent oscillating component proportional field intensity and with a frequency that can be tuned over a wide range (from THz to the near IR) selected by the chemical potential. We illustrate the effect by calculating the induced current as a function of time for a model of a parity broken Weyl semimetal where large Berry curvature near the band inversion transition promotes this nonlinear response.

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