Abstract-Edge currents driven by terahertz radiation in graphene in quantum Hall regime

Helene Plank, M V Durnev, Susanne Candussio, Johanna Pernul, Kathrin-Maria Dantscher, Erwin Mönch, Andreas Sandner, Jonathan Eroms, Dieter Weiss, Vasily V Belkov

http://iopscience.iop.org/article/10.1088/2053-1583/aae39c

We observe that the illumination of  graphene in the quantum Hall regime with polarized terahertz laser radiation results in a direct edge current. This photocurrent is caused by an imbalance of persistent edge currents, which are driven out of thermal equilibrium by indirect transitions within the chiral edge channel. The direction of the edge photocurrent is determined by the polarity of the external magnetic field, while its magnitude depends on the radiation polarization. The microscopic theory developed in this paper describes well the experimental data.

Abstract-A review on terahertz photogalvanic spectroscopy of Bi2Te3- and Sb2Te3-based three dimensional topological insulators

Helene Plank, Sergey D.Ganichev,

https://www.sciencedirect.com/science/article/pii/S0038110118302478

The paper overviews experimental and theoretical studies of photogalvanic effects induced in BiSbTe-based three dimensional topological insulators by polarized terahertz radiation. We present the state-of-the-art of this subject, including most recent and well-established results. We discuss a phenomenological theory based on symmetry arguments and models illustrating the photocurrents origin. We give a brief glimpse of the underlying microscopic theory, as well as an overview of the main experimental results.

Abstract-Terahertz Photogalvanic Spectroscopy of Three Dimensional Topological Insulators

Helene Plank, Sergey D. Ganichev

https://128.84.21.199/abs/1801.04865

The paper overviews experimental and theoretical studies of photogalvanic effects induced in BiSbTe- based three dimensional topological insulators by polarized terahertz radiation. We present the state-of-the-art of this subject, including most recent and well-established results. We discuss a phenomenological theory based on symmetry arguments and models illustrating the photocurrents origin. We give a brief glimpse of the underlying microscopic theory, as well as an overview of the main experimental results.