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  4. Topological effects in dissipative extensions of the Su-Schrieffer-Heeger model

Nov

27

Tuesday

Topological effects in dissipative extensions of the Su-Schrieffer-Heeger model

3.00pm

Seminars

Staff, Students, Academics

Research Centre: Department of Mathematics

Speaker: Guenter Wunner (Stuttgart)

Abstract:

The Su-Schrieffer-Heeger (SSH) model, initially proposed to study solitons in poly- acetylene, is a generic example of a one-dimensional topological insulator. I report on dissipative extensions of the model. We compare the results of two different approaches to describe gain and loss of particles on the lattice: One works with complex PT symmetric potentials, and the other with Lindblad master equations.

Furthermore, we generalize the concept of the Zak phase (Berry phase across the Brillouin zone) to the dissipative scenario and relate it to the topological phases of the original SSH model.

Reference:

F. Dangel, M. Wagner, H. Cartarius, J. Main, G. Wunner, Phys. Rev A 98 013628 (2018)

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When & where

3.00pm - 4.00pmTuesday 27th November 2018

C316 Tait Building City, University of London Northampton Square London EC1V 0HB United Kingdom