Magnetotransport phenomena in terahertz and dc driven Dirac fermion systems

该项目旨在为最近在太赫兹和直流驱动的狄拉克费米子系统中观察到的壮观的磁输运现象开发一个全面的理论，包括单层石墨烯和基于HgTe的拓扑绝缘体的螺旋表面态。该项目解决了太赫兹，霍尔场和声子诱导的磁振荡，它们的非线性相互作用和演变的非微扰制度的强驱动，过渡到非平衡域相在零电阻状态下的条件，以及在回旋共振太赫兹响应及其二次谐波（X2峰）。所发展的理论将解释狄拉克费米子材料特有的效应。特别是，非平凡的Berry相位在非线性输运和多光子过程中的作用将被研究。计划中的理论研究，沿着正在进行的相关实验在里根斯堡，麻省理工学院，维也纳和新西伯利亚，应该提供深入的见解基本光电和输运性质的二维电子系统，并导致其技术设计和功能的重要进展。

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.