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Paper   IPM / Physic / 16566
School of Physics
  Title:   Unidirectional valley-contrasting photocurrent in strained transition metal dichalcogenide monolayers
1.  R. Asgari
2.  D. Culcer
  Status:   Preprint
  Year:  2021
  Supported by:  IPM
We examine the static non-linear optical response of monolayer transition metal dichalcogenides. Whereas the shift current is suppressed, we identify a strong, valley-dependent unidirectional response, which we term a non-reciprocal valley photo-current (NVP). It originates from Kramers symmetry breaking by trigonal warping, which sets its direction. The NVP is proportional to the mobility and is enhanced by the excitonic Coulomb interaction and inter-valley scattering, enabling monitoring of inter-valley transitions. We discuss detection strategies in state-of-the-art experiments.

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