14.06.2018

Pseudo-Andreev Reflection in Superlattice Graphene – seminar


Academic Centre for Materials and Nanotechnology invites for a seminar that will be held on 14th June, 2018, at 14.00 (2.00 pm).

A lecture titled “Pseudo-Andreev Reflection in Superlattice Graphene” will be given by Elizabeth Dresselhaus (Instituut-Lorentz, Leiden University).

Venue: Kawiory 30 Street, building D-16, auditorium room (1.02A)

An abstract of the lecture

This seminar will examine the topological properties of a seemingly simple Hamiltonian that can be generalized to a broad array of physical  systems, such as superlattice graphene. I will discuss the low energy theory of superlattice graphene and identify a symmetry that resembles  particle-hole symmetry. This will parallel the theory of topological superconductivity but in this case the symmetry is in fact related to  the valley degree of freedom. This is the origin of pseudo-Andreev reflection. This finding is key to the valley-switch effect presented in our recent publication (arxiv: 1805.02487). After discussing this  effect, I will conclude with ramifications that this finding could have on valleytronics.