Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Poster Session: Topological Topics (joint session TT/MA)

MA 10.3: Poster

Montag, 1. April 2019, 15:00–18:30, Poster D

Electronic correlation effects on double Dirac semimetals — •Niklas Wagner¹, Domenico Di Sante¹, Sergio Ciuchi², and Giorgio Sangiovanni¹ — ¹Institut fuer Theoretische Physik und Astrophysik, Universitaet Wuerzburg, Germany — ²Department of Physical and Chemical Sciences, University of L’Aquila, Italy

Particles without a high-energy analog, namely special multiple-degeneracy points in the electronic bandstructure of solids protected by fundamental symmetries of the underlying lattice, have been recently postulated in condensed matter physics [1]. A particularly interesting example is that of space groups Nr. 130 and 135, whose Brillouin zones host double Dirac points at high-symmetry points [2]. We study tight-binding models for these two space groups and look at the influence of electronic correlation on the eightfold degeneracies at the touching points of their valence and conduction bands. To this aim, we use methods ranging from simple approaches like the Hubbard-I and Hubbard-III approximations, to more sophisticated ones including DMFT and cluster extensions thereof [3].
B. Bradlyn, et al., Science 353, aaf5037 (2016)
B. Wieder, et al., PRL 116, 186402 (2016)
D. Di Sante, et al., PRB 96, 121106(R) (2017)