University of Cambridge > > Cavendish Physical Society > Thermodynamics beyond equilibrium -- the physics of periodically driven quantum systems"

Thermodynamics beyond equilibrium -- the physics of periodically driven quantum systems"

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Leona Hope-Coles.

The field of thermodynamics is one of the crown jewels of classical physics. Extending its ideas and concepts to the non-equilibrium setting is a challenging topic of perennial interest. Here, we study perhaps the simplest non-equilibrium class of quantum problems, namely Floquet systems, i.e. systems whose Hamiltonians depend on time periodically, H(t + T) = H(t). For these, there is no energy conservation, and hence not even a natural definition of temperature. We find that it is nonetheless possible to identify three fundamentally distinct thermodynamic ensembles. We also ask if there exists a sharp notion of a phase in such driven, interacting quantum systems. Disorder turns out to play a crucial role, enabling the existence of states which are straightforward analogues of equilibrium states with broken symmetries and topological order, while others—genuinely new to the Floquet problem—are characterized by a combination of order and non-trivial periodic dynamics.

This work was done in collaboration with Arnab Das, Vedika Khemani, Achilleas Lazarides and Shivaji Sondhi: Phys. Rev. Lett. 112, 150401 (2014); Phys. Rev. E 90 , 012110 (2014); Phys. Rev. Lett. 115, 030402 (2015); arXiv:1508.03344.

This talk is part of the Cavendish Physical Society series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.


© 2006-2024, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity