University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Wednesday, October 4th 2017
1:25 pm:
Speaker: Tobias Gulden, Technion - Israel Institute of Technology, Haifa
Subject: Prethermal states in slowly driven many-body systems

Topological phases offer diverse novel properties of matter. These are mostly determined by material properties which can not easily be changed. An alternative are driven topological systems such as Floquet topological insulators and charge pumps. In these cases application of an external time-periodic field allows for easy control of the topology of the system. In this talk I discuss general properties of slowly driven systems in the presence of interactions with the example of a charge pump. Intraband scattering thermalizes all particles within one band which makes topological properties of partly filled bands accessible. On the other hand interactions also cause excitations to the other band with opposite topological index. I will show that for a wide class of systems there exists a prethermal state in which one band is fully thermalized while the other band remains unoccupied. During this time window the topological properties are experimentally accessible.

Faculty Host: Alex Kamenev

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