Theoretical Physics Seminar

Speaker: Anne E.B. Nielsen

Title: Fractional quantum Hall physics in lattice systems

Abstract:

The fractional quantum Hall effect can be displayed by electrons moving in two dimensions in a strong magnetic field and at very low temperatures. The effect is intriguing for several reasons. First, the systems can be used as a resistance standard. Second, it is necessary to develop new tools to investigate the systems. It has, e.g., been necessary to rethink the way phase transitions are treated. Third, the systems can host quasi-particles that are anyons. Anyons are neither bosons nor fermions, and their properties can, e.g., be exploited in quantum computers.

Fundamental interest and the hope to find easier and more robust ways to realize the fractional quantum Hall effect experimentally have triggered a lot of effort towards clarifying under which conditions the effect can occur. In particular lattice systems have received much attention.

In this talk, I will first give an introduction to topology, anyons, and the fractional quantum Hall effect. I will then discuss strategies to obtain fractional quantum Hall physics in lattice systems.

Coffee/tea and cake will be served at 14:00