SAMOP 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
QI: Fachverband Quanteninformation
QI 13: Quantum Simulation
QI 13.5: Vortrag
Dienstag, 7. März 2023, 12:00–12:15, F428
Signatures of MBL in a dilute gas of ultracold polar molecules in a 2D optical lattice — •Timothy J. Harris1,2,3, Andrew J. Groszek1, Arghavan Safavi-Naini4,5, and Matthew J. Davis1 — 1ARC CoE EQUS, University of Queensland, Brisbane, Australia — 2LMU Munich, Munich, Germany — 3MCQST, Munich, Germany — 4QuSoft, Amsterdam, the Netherlands — 5University of Amsterdam, Amsterdam, the Netherlands
We present our work exploring many-body localization (MBL) in systems of ultracold polar molecules in two-dimensional (2D) optical lattices. We characterize a novel ergodicity breaking mechanism that emerges in molecular quantum simulators when a fraction of the lattice sites are left unoccupied. We consider a system of diatomic polar molecules pinned in a deep 2D optical lattice with at most one molecule per site. The system is well described by a dipolar spin-1/2 Hamiltonian, with effective on-site disorder arising from the dilute, randomised configurations of molecules in the lattice. We perform extensive exact diagonalisation simulations to explore non-equilibrium dynamics and eigenstate properties for systems of up to 16 molecules at 50% lattice filling. We observe several essential signatures of MBL, including retention of initial state memory in the system's long-time dynamics, logarithmic growth of bipartite entanglement entropy, divergent entanglement fluctuations and a transition to Poissonian level-spacing statistics. Our results are realisable in current molecular quantum gas microscope experiments, and open exciting new avenues to explore non-equilibrium many-body physics with ultracold polar molecules.