Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster VI

Q 55.21: Poster

Thursday, March 14, 2024, 17:00–19:00, Tent B

Signatures of many-body localization in a two-dimensional lattice of ultracold polar molecules with disordered filling — •Timothy J. Harris^1,2,3, Andrew J. Groszek¹, Arghavan Safavi-Naini^4,5, and Matthew J. Davis¹ — ¹ARC Centre of Excellence for Engineered Quantum Systems, School of Mathematics and Physics, University of Queensland, Brisbane, QLD 4670, Australia — ²Department of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, 80333 München, Germany — ³Munich Center for Quantum Science and Technology, 80799 München, Germany — ⁴Institute for Theoretical Physics, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, the Netherlands — ⁵QuSoft, Science Park 123, 1098 XG Amsterdam, the Netherlands

We present our work exploring many-body localization (MBL) in systems of ultracold polar molecules confined to a two-dimensional (2D) optical lattice with disordered filling. We perform large-scale exact diagonalization simulations to characterize the dynamics and eigenstate properties of the system. We observe several key signatures of MBL as the relative strength of the spin-density interactions is increased, including retention of initial state memory in the system's long-time dynamics, logarithmic growth of bipartite entanglement entropy and a transition to Poissonian level-spacing statistics. Our predictions may be realised in state-of-the-art quantum gas microscope experiments with alkali-metal dimers, and open exciting new avenues to explore non-equilibrium many-body physics with ultracold polar molecules.

Keywords: ultracold polar molecules; many-body localization; quantum magnetism; quantum simulation; optical lattices