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TT: Fachverband Tiefe Temperaturen

TT 16: Poster: Transport

TT 16.16: Poster

Monday, March 27, 2023, 15:00–18:00, P2/OG4

Strain-induced pseudo-Landau levels in semimetals from dimensional reduction — •Fabian Köhler and Matthias Vojta — Würzburg-Dresden Cluster of Excellence ct.qmat, Technische Universität Dresden, Germany

Non-uniform strain applied to graphene's honeycomb lattice can induce pseudo-Landau levels in the single-particle spectrum. We generalize this procedure to d-dimensional hyperdiamond-lattices and solve the corresponding continuum theory. The unstrained tight-binding Hamiltonian has semimetallic bandstructure with a (d-2)-dimensional nodal manifold, which transforms into a series of relativistic Landau levels under suitable strain. We show that a mechanism of dimensional reduction is at play here that goes beyond the conventional minimal coupling framework. This mechanism generates two-dimensional Landau-level problems with identical level spacing at each point of the nodal manifold.