Programme

O.10 -- Oral, VCTP-45

Date: Tuesday, 13 October 2020

Time: 11:00 - 11:20

Real-approach for the electronic calculation of twisted bilayer graphene: The neutrino oscillation-like dynamics of electrons

Van-Nam Do

Phenikaa Institute for Advanced Study (PIAS), Phenikaa University

Stacking two-dimensional materials is a novel method based on the lego principle for creating new van der Waals heterostructures with well-controlled properties. However, it usually results in a system of reduced symmetry compared to the two constituent lattices. As the translational symmetry of the hetero-lattices is broken, the electronic calculations based on the time-independent Schrodinger/Kohn-Sham equation combined withh the Bloch theorem are no longer applicable. In this talk, I will show that methods based on the time-dependent Schrodinger equation in real space are a powerful alternative to treat the problem. Applied to the case of twisted bilayer graphene I will show the dynamics of electrons in the real lattice of generic configurations using the tight-binding description. I will show that the interlayer electronic coupling induces the interchange transfer of waves between the two graphene layers, resulting a picture similar to that of neutrino oscillations.

Presenter: Do Van-Nam