High-order harmonic generation in graphene: nonlinear coupling of intra and interband transitions

(submitted), (2020)

High-order harmonic generation in graphene: nonlinear coupling of intra and interband transitions

Shunsuke A. Sato, Hideki Hirori, Yasuyuki Sanari, Yoshihiko Kanemitsu, Angel Rubio

We investigate high-order harmonic generation (HHG) in graphene with a quantum master equation approach. The simulations reproduce the observed enhancement in HHG in graphene under elliptically polarized light [N. Yoshikawa et al, Science 356, 736 (2017)]. On the basis of a microscopic decomposition of the emitted high-order harmonics, we find that the enhancement in HHG originates from an intricate nonlinear coupling between the intraband and interband transitions that are respectively induced by perpendicular electric field components of the elliptically polarized light. Furthermore, we reveal that contributions from different excitation channels destructively interfere with each other. This finding suggests a path to potentially enhance the HHG by blocking a part of the channels and canceling the destructive interference through band-gap or chemical potential manipulation.

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arxiv
http://arxiv.org/abs/2010.06275
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This work was supported by JSPS KAKENHI Grant Numbers 20K14382 and 19H05465, the European Research Council (ERC-2015-AdG694097), the International Collaborative Research Program of Institute for Chemical Research, Kyoto University (grant # 2020-13), the Cluster of Excellence ’Advanced Imaging of Matter’ (AIM), Grupos Consolidados (IT1249-19) and SFB925 ”Light induced dynamics and control of correlated quantum systems”. The Flatiron Institute is a division of the Simons Foundation.

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