867. Wilhelm and Else Heraeus Seminar on "Quantum Electron-Photon Interactions"

Inducing symmetry forbidden anomalous non-linear charge and Hall responses in photoexcited graphene

Not scheduled

20m

Charles University (Prague)

Poster

Speaker

Mr Arkajyoti Maity (Max Planck Institute for the Physics of Complex Systems, Dresden)

Description

We theoretically investigate the prospect of inducing a non-trivial, non-linear Hall response in Dirac materials obeying both inversion and time-reversal symmetries, specifically pristine graphene. This is possible by
creating a non-thermal electronic distribution in the system by driving it with an intense sub-cycle laser pulse. The resultant non-equilibrium state, generated by non-adiabatic transitions induced by the laser, can be made to break the general trigonal (C3) symmetry of the Hamiltonian and hence allow for a second-order Hall response to a weak electric probe, closely related to the quantum geometry of the
system.