Lledó Veloso, Cristóbal;
(2021)
Dissipative phase transitions in light-matter lattice systems.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The study of collective dynamics of quantum systems far from equilibrium offers the exciting opportunity of discovering new phases of matter with exotic properties not found in any other states we are familiar with. Besides being driven by an external agent, these non-equilibrium systems also couple to the environment which surround them, giving rise to rich and complex dynamics which are not yet fully understood. In this thesis, I start by introducing the basic concepts of dissipative phase transitions in quantum systems far from equilibrium, which helps to classify phases and the transformations among them. I then focus on a photonic toy model where a combination of different critical behaviours—due to the interplay of different dissipative phase transitions—takes place. In particular, I discuss the role of nonlocal dissipation and how it can help to stabilise a semiclassical dissipative time crystal characterised by the breaking of the time-translation symmetry of the steady state and by the emergence of a periodic response. In the final part, I focus on a theoretical proposal for the realisation of a non- equilibrium light-matter Bose-Einstein condensate in a synthetic magnetic field. The platform is a lattice of resonators in a strained honeycomb geometry, which serves to emulate condensed matter systems where the interplay between interactions and external magnetic fields is important. We take advantage of the competition between dissipation and a spatial modulation of the external photonic pump to stabilise the condensate in a rotating state, where it forms arrays of vortices akin to a rotating superfluid or a superconductor pierced by external a magnetic field.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Dissipative phase transitions in light-matter lattice systems |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2021. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10135509 |
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