Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 41: Poster Session IIIa
A 41.21: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Orangerie
Hole dynamics and bound states in a spin chain of Rydberg atoms — •Fabian Letscher1, David Petrosyan2, and Michael Fleischhauer1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, D-67663 Kaiserslautern, Germany — 2Institute of Electronic Structure and Laser, FORTH, GR-71110 Heraklion, Crete, Greece
Spin lattice models play a central role in the studies of quantum magnetism and non-equilibrium dynamics of spin excitations. Here, we investigate the dynamics of 1D spin lattice models realized by coupling atomic ground states to high lying Rydberg states.
First, we discuss a chain of driven dissipative Rydberg superatoms, where each superatom consists of a mesoscopic ensemble of atoms. In the so called facilitation regime (off resonant excitation), a single superatom excitation triggers an excitation cascade of neighboring superatoms. We discuss the relaxation dynamics and show that the steady state resembles a hard rod liquid of holes - a nonexcited superatom surrounded by two excited ones. Second, we discuss the coherent dynamics of two Rydberg excitations immersed in a lattice of ground state atoms dressed to another Rydberg state. We show that the competition between van-der-Waals interaction and resonant dipole exchange interaction leads to the formation of mobile bound states of Rydberg excitations.