Theory Seminar: Squeezed quantum many-body scars in PXP models

Bennet Windt (MPQ)
Out of equilibrium, generic closed many-body systems are expected to thermalise, according to the prescriptions of the Eigenstate Thermalisation Hypothesis (ETH).

Bennet Windt (MPQ)
Group seminar (hybrid format: online/seminar room B2.46)
Wed, 24 November 2021, 11:30 am (MEZ)

Abstract:

Out of equilibrium, generic closed many-body systems are expected to thermalise, according to the prescriptions of the Eigenstate Thermalisation Hypothesis (ETH). However, recent experiments with one-dimensional Rydberg atom arrays revealed unexpected periodic coherent revivals of certain ordered initial states following a rapid quench. This phenomenon of non-ergodic behaviour sensitive to initial conditions has since been found to be the symptom of so-called quantum many-body scars (QMBS) in the thermal many-body eigenspectrum, and has garnered significant research interest, both theoretical and experimental in nature. In particular, it has been related to various properties of a class of kinetically constrained, strongly interacting spin models known as the PXP model. In my talk, I will first review the basic phenomenology and theoretical description of Rydberg QMBS. I will then present a novel method for enhancing QMBS in PXP models on arbitrary bipartite graphs by spin squeezing, using intuition gathered from the analytically tractable limiting case of the complete bipartite graph.

If you'd like to participate in the seminar, please contact us!