Reminder CMSP Seminar Series @ICTP Thursday 14 February 11 am - Michele FABRIZIO

[CM Section]

REMINDER
Condensed Matter and Statistical Physics Seminar Series

Thursday 14 February at 11:00 a.m.
Luigi Stasi Seminar Room, first floor, Leonardo building

Michele FABRIZIO (SISSA, Trieste)

'Playing with the Physics of Twisted Bilayer Graphene

Abstract:
In this talk I will review our ongoing activity on twisted bilayer
graphene at the first magic angle. I will first discuss the constraints
on a low energy description put forth by the spatial symmetries of
the Bloch wavefunction obtained through a realistic tight-binding
calculation performed on a relaxed structure.

Next I will propose a minimal tight-binding model that reproduces the
elementary band representation of the emergent P622 low-energy
space group.

Finally, I will show how the emergent symmetry shows up in the phonon
spectrum, which suggests the intriguing possibility of an Exe Jahn-Teller
effect as a possible mechanism to split the so-called valley degeneracy.