Magnetotransport phenomena in terahertz and dc driven Dirac fermion systems

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This project aims to develop a comprehensive theory for spectacular magnetotransport phenomena recently observed in THz and dc driven Dirac fermion systems including monolayer graphene and helical surface states of HgTe-based topological insulators. The project addresses the THz-, Hall field-, and phonon-induced magnetooscillations, their nonlinear interplay and evolution in the non-perturbative regimes of strong driving, conditions of transition to nonequilibrium domain phases in zero resistance states, as well as the resonant THz response at the cyclotron resonance and its second harmonics (X2 peak). The developed theory will account for effects specific to Dirac fermion materials. In particular, the role of the nontrivial Berry phase in the nonlinear transport and multiphoton processes will be studied. The planned theoretical studies, along with the ongoing related experiments in Regensburg, MIT, Wien, and Novosibirsk, should provide deep insights into fundamental optoelectronic and transport properties of 2D electron systems and lead to important advances in their technological design and functionalities.