Department of Physics

Indian Institute Of Technology Madras , Chennai

Dynamical measurement of the interaction strength in helical Luttinger Liquids

Speaker : Tobias Müller, University of Würzburg, Germany.

2018-12-13

Abstract :

In one-dimensional Luttinger liquids the interaction strength is determined by the Luttinger Parameter K. It proves proves difficult to be measured, as it is usually hidden in power-law dependencies on temperature or bias. In this talk I will propose a setup, which allows a dynamical measurement of this parameter. In this talk we will, based on an equation of motion description of Luttinger Liquids, discuss a setup with a capacitive gate, which allows to probe the interactions directly. In this setup, an expression for the frequency dependence of the conductivity can be obtained, from which we can extract K directly and from a low frequency expansion. Furthermore the influence of the precise form of the change in interactions at the contacts is examined using the formalism. As a perfectly suited system to test the predictions, we will shortly discuss helical edge states of topological insulators.

Key Speaker Tobias Müller, University of Würzburg, Germany.
Guests None
Place Conference Room
Start Time 2:00 PM
Finish Time 3:00 PM
External Link None