Group Seminar via Zoom: Many-body dynamics of ultracold polar molecules in an optical lattice

May 10, 2022

Tim Harris, ARC Centre of Excellence for Engineered Quantum Systems (EQUS), The University of Queensland, Australia
Group Seminar via video conference (Zoom)
Tuesday, May 10, 9:00 am (MEZ)

Due to the Covid-19 pandemic, we are still holding our group seminars and journal clubs via video conference. This procedure enables us to continue our research, enhance discussions and exchange important information.


Following recent advances in the manipulation of atomic, molecular and optical systems, quantum simulators of strongly-correlated many-body lattice models have been realized on a number of experimental platforms, including ultracold gases of neutral atoms and polar molecules, as well as Rydberg atom arrays and trapped ions. In particular, ultracold polar molecules confined in optical lattices provide a flexible framework to study models of quantum magnetism due to their long-range dipolar interactions and rich internal structure. The microscopic parameters of these models can be precisely controlled through the application of external fields.

One of the challenges with current polar molecules experiments is that it is only possible to achieve lattice fillings of <50% [1]. Although this is typically considered a limitation of the system, in our work we utilize this feature to study non-equilibrium quantum dynamics in the presence of disorder. Specifically, we model the system as a dipolar t-J-V-W model [2, 3] with effective on-site disorder arising from the dilute, randomised configurations of molecules in the lattice [4], and characterize the long-time dynamics and eigenstate properties in 1D systems which exhibit signatures of many-body localization (MBL). Our preliminary results indicate the model exhibits a transition to an MBL phase for increasing molecular filling and dipolar interaction strength.

[1] S. Moses et al., Science 350, 659-662 (2015)
[2] A. V. Gorshkov et al., Phys. Rev. Lett. 107, 115301 (2011).
[3] A. V. Gorshkov et al., Phys. Rev. A 84, 033619 (2011).
[4] N. Yao et al., Phys. Rev. Lett. 113, 243002 (2014).

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