University of St Andrews
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Bose–Einstein condensation of exciton polaritons
A comprehensive set of experiments giving compelling evidence for BEC of polaritons of bosonic quasi-particles are detailed, which indicate the spontaneous onset of a macroscopic quantum phase.
Minimal excitation states of electrons in one-dimensional wires.
It is shown that by using quantized pulses of simple form one can suppress the particle-hole pairs which are created by a generic excitation, and a method of their detection which relies on noise measurement.
Spontaneous rotating vortex lattices in a pumped decaying condensate.
This work model trapped, pumped, decaying condensates by a complex Gross-Pitaevskii equation and analyzes the density and currents in the steady state.
Introduction to the Dicke Model: From Equilibrium to Nonequilibrium, and Vice Versa
The Dicke model describes the coupling between a quantized cavity field and a large ensemble of two‐level atoms. When the number of atoms tends to infinity, this model can undergo a transition to a…
Boundary Time Crystals.
- F. Iemini, A. Russomanno, Jonathan Keeling, M. Schirò, M. Dalmonte, R. Fazio
- PhysicsPhysical review letters
- 16 August 2017
This work introduces boundary time crystals and analyzes in detail a solvable model where an accurate scaling analysis can be performed.
Cluster mean-field approach to the steady-state phase diagram of dissipative spin systems
We show that short-range correlations have a dramatic impact on the steady-state phase diagram of quantum driven-dissipative systems. This effect, never observed in equilibrium, follows from the fact…
Efficient non-Markovian quantum dynamics using time-evolving matrix product operators
- A. Strathearn, P. Kirton, D. Kilda, Jonathan Keeling, B. Lovett
- PhysicsNature Communications
- 27 November 2017
A general and yet exact numerical approach that efficiently describes the time evolution of a quantum system coupled to a non-Markovian harmonic environment using matrix product operator methods.
Nonequilibrium quantum condensation in an incoherently pumped dissipative system.
Spontaneous quantum coherence in an out of an equilibrium system, coupled to multiple baths describing pumping and decay is studied, leading to correlation functions that differ both from an isolated condensate and from a laser.
Nonequilibrium model of photon condensation.
A nonequilibrium model of condensation and lasing of photons in a dye filled microcavity is developed and when the photons are able to reach a thermal equilibrium Bose-Einstein distribution is investigated.