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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.12: Poster

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

Quantum diffusion in magic-angle twisted bilayer graphene — •Taher Rhouma, Ahmed Missaoui, and Guy Trambly de Laissardière — Laboratoire de Physique théorique et Modélisation, CY Cergy Paris Université / CNRS, Cergy-Pontoise, France.

The discovery of correlated insulators and superconductivity due to flat bands in twisted bilayer graphene (TBG) [1] at so-called “magic angles” has stimulated the study of their electronic properties. Here we present a theoretical study of the electronic structure and quantum transport properties of these flat-band states, considering as well as possible the structural effect of local defects, such as resonant and non-resonant scatterers. Our real space method [2,3] takes into account all the effects of defects on the electronic structure itself and the effects of multiple scattering on conductivity. It shows, among other things, that due to the incredibly low velocity of flat-band states, the usual Bloch-Boltzmann theories are no longer valid.

[1] Y. Cao et al., Nature 556, 43 (2018); Nature 556, 80 (2018)

[2] F. Triozon et al., Phys. Rev. B 65, 220202 (2002)

[3] O. Faizy Namarvar et al., Phys. Rev. B 101, 245407 (2020)

Keywords: Twisted bilayer graphene; 2D Materials; Quantum transport