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TT: Fachverband Tiefe Temperaturen
TT 12: Topological Insulators (joint session MA/TT)
TT 12.3: Talk
Monday, March 27, 2023, 15:30–15:45, HSZ 403
Manipulating topological feature of massive Dirac particle with scalar potential — •Sumit Ghosh1,2, Yuriy Mokrousov1,2, and Stefan Blügel1 — 1PGI-1, Forschungszentrum Jülich, Germany — 2Institute of Physics, Johannes Gutenberg University Mainz, Germany
Topology is one of the central aspect of modern spintronics. Different physical observables as well as transport properties that originates from the nontrivial topology of the system shows significant robustness against different external perturbation. Manipulating the topology of a system on the other hand is a highly non-trivial task since it requires tuning the internal degrees of freedom. In this presentation we are going to present an intrinsic mechanism to manipulate the topological feature and associated transport properties by using scalar potential. We systematically demonstrate how a scalar potential can invert the mass term of a massive Dirac particle which subsequently leads to the change of the topological index. We further demonstrate how this mechanism can be exploited to control the formation of edge states which can control the transport properties. This study thus provides a better understanding of the origin of the topological properties as well as a simple way to manipulate them. [https://arxiv.org/abs/2204.06412]