Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Ultracold Plasmas and Rydberg Systems II (joint session Q/A)
A 15.4: Vortrag
Montag, 5. März 2018, 17:00–17:15, K 2.013
Localisation dynamics in a disordered Rydberg ladder — •Maike Ostmann1,2, Jiri Minar1,2, Matteo Marcuzzi1,2, and Igor Lesanovsky1,2 — 1School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom — 2Centre for the Mathematics and Theoretical Physics of Quantum Non-equilibrium Systems, University of Nottingham
Rydberg lattice systems are currently studied in a number of laboratories worldwide as they constitute a promising platform for quantum information processing and the quantum simulation of many-body systems out of equilibrium. We are studying the transport of excitations in Rydberg systems under the so-called facilitation condition, where the excitation of an atom to a Rydberg state is strongly enhanced by an excited neighbour. In particular we are interested in understanding the impact of disorder caused by the uncertainty of the atomic positions within the individual lattice sites. In a recent work, a connection between localisation in real space and configuration (Fock) space was established. Building on this, we are investigating the localisation phenomena in a Rydberg ladder forming a so-called Lieb lattice in configuration space. A Lieb lattice supports a macroscopically degenerate flat band which gives rise to localised eigenstates in the absence of disorder. We are exploring the influence of the disorder on these localised eigenstates. Introducing disorder to our system leads to a non-monotonic behaviour of the localisation as a function of the interaction strength. Furthermore, we are studying how different types of disorder effect the scaling of the localisation length.