SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Topological Insulators (joint session MA/TT)

MA 10.3: Vortrag

Montag, 27. März 2023, 15:30–15:45, HSZ 403

Manipulating topological feature of massive Dirac particle with scalar potential — •Sumit Ghosh^1,2, Yuriy Mokrousov^1,2, 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]