CMSP Seminar Series @ICTP STASI Room: J. BUDICH Thursday 27 April at 11:30 a.m.

[Condensed Matter Section]

ICTP Seminar Series in Condensed Matter and Statistical Physics
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Thursday 27 April at 11:30 a.m.

Luigi Stasi Seminar Room, first floor, ICTP Leonardo building
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Speaker:
Jan BUDICH (Goteborg Univ., Dept. of Physics, Sweden)

Title:
Topological Quantum Matter Far from Equilibrium

Abstract:
Topological states of quantum matter such as topological insulators and 
superconductors have been an active field of research in physics for 
many years. The recent experimental progress on their realization with 
ultracold atomic gases raises natural questions about the notion of 
topological quantum matter far from thermal equilibrium. In this talk, 
we present our theoretical findings in this context.

We first discuss the non-equilibrium Hall response of a system 
initialized in a topologically trivial state before its Hamiltonian is 
ramped into a Chern insulator phase, comparing the coherent dynamics 
with effects of dephasing. In the second part of the talk, we discuss 
non-equilibrium properties of driven systems. In particular, we show how 
a perfect spin momentum locking, so far only known from edge states of 
two-dimensional topological insulators can emerge in the stroboscopic 
dynamics of one-dimensional Floquet lattice systems. Finally, we discuss 
dynamically defined topological quantum numbers that have no 
non-equilibrium counterpart, and report on their very recent 
experimental observation.