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Much insight has come from the idea that non-equilibrium systems can exhibit phenomena not found in thermal equilibrium. Understanding these non-equilibrium phases and the transitions between them is a major research frontier of modern many-body physics. In my talk I will outline two examples of novel physics found in non-equilibrium quantum systems. The first, discrete time crystals (DTCs), are a prototypical example of a non-equilibrium phase of matter, defined by the fact that they spontaneously break time-translation symmetry. I will describe the results of an experiment involving the observation of a DTC in a doped semiconductor platform, where both interactions and dissipation play a significant role in stabilizing the DTC order. Next I will discuss measurement-induced transitions, which are a new class of phase transition in open quantum systems. I will focus on two aspects of these transitions: the effect of the underlying unitary dynamics on the nature of the phase transition, and the role of dimensionality in determining the universal properties at criticality.

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Oliver Lunt, University College London
Zoom ( URL https://uni-koeln.zoom.us/j/92374710227 )
Contact: not specified