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Atomic frustration-based twistronics

October 14, 2021 at 14:00hs (Brasília) /1PM, (USA Eastern Standard Time): Prof. Prof. Prof. Dr. Antonio C. Seridonio - UNESP lha Solteira
por Portal PPFIS Infis
Publicado: 13/10/2021 - 08:11
Última modificação: 13/10/2021 - 08:11

In this talk we will discuss atomic frustrated states in diatomic molecules hosted by the bilayer graphene setup twisted by the first magic angle and with broken inversion symmetry in the Dirac cones of the system mini-Brillouin zones. Such states show local spectral features typically from uncoupled atoms, but counterintuitively, they also exhibit nonlocal molecular correlations, which turn them into atomically frustrated. By considering a particle-hole symmetric molecule in the Moiré superlattice length-scale, distinctly from the metallic Weyl counterparts, a molecular zero mode atomically frustrated at the spectral densities of the dimer’s atoms, is then revealed. To this end, a strong metallic phase with a plateau in the density of states established by the broken inversion symmetry, together with pronounced blue and red shifts in the molecular levels, due to the magic angle condition, should occur synergistically with atomic Coulomb correlations. Consequently, an entire collapse of these molecular peaks into a single one atomically frustrated, taking place exactly at the Fermi energy, becomes feasible just by tuning properly opposite gate voltages attached to the graphene monolayers. Therefore, unusual molecular bindings are proposed via the twistronics of the bilayer graphene system, in particular, if its metallic phase is fully established.

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