"Damping of high temperature Bloch Oscillations in interacting fermions" John Goold, Trinity College Dublin, Ireland

Date

Tuesday, December 3, 2019 - 11:00 to 12:00

Location

Meeting Room C016, Level C, Lab1

Description

Speaker

Prof. John Goold
Assistant Professor, Trinity College Dublin, Ireland

Abstract

The physics of non-interacting lattice electrons in a strong electromagnetic field is a well known problem in condensed matter physics. Here the single particle states of the model are exponentially localised through the Wannier-Stark basis and undergo bloch oscillations with a period which is inversely proportional to the strength of the applied field. Quite recently it has been shown that at high temperatures localisation remains in the presence of electron-electron interactions and that the system becomes delocalised at a critical strength of the applied field. This is analogous to the many-body localisation problem which is driven by a disordered potential. Here we adopt a dynamical approach by studying the the propagation of highly localised wave packets at high temperature using a combination of dynamical typicality and Krylov subspace techniques. By studying the time dependent density and variance we not only able to study the damping of bloch oscillations as a function of interaction strength but also the onset of transport in a transparent way from a dynamical perspective. 

 

Looking forward to seeing many of you at the seminar.

-Quantum Systems Unit / Busch Unit

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