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Q: Fachverband Quantenoptik und Photonik
Q 56: Quantum Optics III
Q 56.7: Vortrag
Donnerstag, 14. März 2019, 15:45–16:00, S Ex 04 E-Tech
Localization in spin chains with facilitation constraints and disordered interactions [1] — •Maike Ostmann1,2, Matteo Marcuzzi1,2, Juan P. Garrahan1,2, and Igor Lesanovsky1,2 — 1School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom — 2Centre for the Theoretical Physics and Mathematics of Quantum Non-equilibrium Systems, The University of Nottingham
Quantum many-body systems with kinetic constraints exhibit intriguing relaxation dynamics. Recent experimental progress in the field of cold atomic gases offers a handle for probing collective behavior of such systems, in particular for understanding the interplay between constraints and disorder. We explore a spin chain with facilitation kinetic constraints --- by which an initial excitation can ``seed'' the nucleation of an excitation cluster --- together with disorder that originates from spin-spin interactions [2,3]. The specific model we study, which is realized in a natural fashion in Rydberg quantum simulators, maps onto an XX-chain with non-local disorder. We characterize the localization properties and find signatures of a crossover between a delocalized and a localized phase. Our study demonstrates a need to consider situations that differ from the standard settings for MBL of local on-site disorder and clean interactions) in order to study possible localization in constrained systems realizable in experiments [3].
[1] M. Ostmann et al., arXiv 1811.01667 (2018), [2] M. Ostmann et al., arXiv 1802.00379 (2018), [3] M. Marcuzzi et al., Phys. Rev. Lett 118, 063606 (2017)