Venue: Online via zoom
Title: Dissipation induced non-stationary complex quantum dynamics
Abstract: The assumption that physical systems relax to a stationary state in the long-time limit underpins statistical physics and much of our intuitive understanding of scientific phenomena. For isolated systems, this follows from the eigen state thermalization hypothesis. When an environment is present the expectation is that all of phase space is explored, eventually leading to stationarity.
In this talk, we will identify and discuss simple and generic conditions for dissipation to prevent a quantum many-body system from ever reaching a stationary state . We go beyond dissipative quantum state engineering approaches towards controllable long-time non-stationary dynamics typically associated with macroscopic complex systems. The resulting coherent and oscillatory evolution constitutes a dissipative version of a quantum time-crystal.
We will show how such dissipative dynamics can be engineered and studied with fermionic ultracold atoms in optical lattices using current technology. We discuss how dissipation leads to long-range quantum coherence, complexity, and η-pairing indicating a superfluid state in these setups  and the potential connection to driving induced superconductivity .
 B. Buca, J. Tindall, and D. Jaksch, Complex coherent quantum many-body dynamics through dissipation, Nature Communications 10, 1730 (2019)
 J. Tindall, B. Buca, J.R. Coulthard, D. Jaksch, Heating-Induced Long-Range η-Pairing in the Hubbard Model, Phys. Rev. Lett. 123, 030603 (2019).
 J. Tindall, F. Schlawin, M. Buzzi, D. Nicoletti, J.R. Coulthard, H. Gao, A. Cavalleri, M. Sentef and D. Jaksch, Dynamical Superconductivity in a Frustrated Many-Body System, preprint arXiv:2005.09073 (2020).
Speaker: Dieter Jaksch, University of Oxford and CQT, NUS, Singapore
Organizer and Host: CQT Principal Investigator Dimitris G. Angelakis