Wednesday 2 June; Delft, Leonid Levitov 'Flavor symmetry and competition of orders in graphene bilayer'



Time: 16:00

Location: Zaal E,

Flavor symmetry and competition of orders in graphene bilayer

We analyze competition between different ordered states in bilayer graphene (BLG). Combining arguments based on SU(4) spin-valley flavor symmetry with a mean field analysis, we identify the lowest energy state with the anomalous Hall insulator (AHI). This state is an SU(4) singlet excitonic insulator with broken time reversal symmetry, exhibiting quantized Hall effect in the absence of external magnetic field. Applied electric field drives an Ising-type phase transition, restoring time reversal symmetry. Applied magnetic field drives a transition from the AHI state to a quantum Hall ferromagnet state. We estimate energies of these states, and predict the phase diagram.


18 - 23 March 2019

NanoFront Winter Retreat 2019link

2 - 3 April 2019

BioSB2019: Register now!link

6 - 7 June 2019

Casimir Open Days 2019link

24 - 28 June 2019

BioBusiness Summer Schoollink