title: Dynamical unbinding transition in a periodically driven Mott insulator.
abstract: We study the double occupancy in a fermionic Mott insulator at half filling generated via a dynamical periodic modulation of the hopping amplitude. Tuning the modulation amplitude, we describe a crossover in the nature of doublon-holon excitations from a Fermi golden rule regime to damped Rabi oscillations. The decay time of excited states diverges at a critical modulation strength, signaling the transition to a dynamically bound nonequilibrium state of doublon-holon pairs. A setup using a fermionic quantum gas should allow the study of the critical exponents.
authors.affiliation: Theoretische Physik, ETH Zurich, CH-8093 Zurich, Switzerland.
authors.forename: Fabian
authors.initials: F
authors.lastname: Hassler
authors.forename: Andreas
authors.initials: A
authors.lastname: Rüegg
authors.forename: Manfred
authors.initials: M
authors.lastname: Sigrist
authors.forename: Gianni
authors.initials: G
authors.lastname: Blatter