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TT: Fachverband Tiefe Temperaturen

TT 57: Topology: Poster

TT 57.10: Poster

Wednesday, March 20, 2024, 15:00–18:00, Poster E

Instabilities driven by electron-electron interactions in Weyl semimetals — •Eva Lopez Rojo, Julia M. Link, and Carsten Timm — TU Dresden, Germany

The consequences of electron-electron interactions in the presence of two Weyl points has been previously studied [1-3]. Inter-valley interactions, meaning interactions between electrons in each of the Weyl cones with opposite chirality, have been found to give rise to an excitonic instability. The resulting exciton condensate spontaneously breaks chiral symmetry, transforming the Weyl semimetal into an axionic insulator. The resulting charge density wave phase and its topological properties have also been examined. In this poster, we introduce a formalism that enables the exploration of how the aforementioned axionic physics extends to a more realistic scenario featuring multiple Weyl points.

[1] Z. Wang and S.-C. Zhang, Phys. Rev. B 87, 161107(R) (2013).

[2] D. Sehayek, M. Thakurathi, and A. A. Burkov, Phys. Rev. B 102, 115159 (2020).

[3] E. Bobrow, C. Sun, and Y. Li, Phys. Rev. Res. 2, 012078(R) (2020).

Keywords: Weyl semimetals; Axionic insulators