Dr. Graham Reid defends his thesis!
On this day, Jan. 19, 2023, Graham Reid defended his thesis. Congratulations Graham!
Dark solitons in Bose–Einstein condensates: a dataset for many-body physics research
We establish a dataset of over 1.6 x 10^4 experimental images of Bose–Einstein condensates containing solitonic excitations to enable machine learning (ML) for many-body physics research. About 33% of this dataset has manually assigned and carefully curated labels. The remainder …
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Dynamical instability of 3d stationary and traveling planar dark solitons
Here we revisit the topic of stationary and propagating solitonic excitations in self-repulsive three-dimensional (3D) Bose–Einstein condensates by quantitatively comparing theoretical analysis and associated numerical computations with our experimental results. Motivated by numerous experimental efforts, including our own herein, we …
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Dynamically Induced Symmetry Breaking and Out-of-Equilibrium Topology in a 1D Quantum System
Nontrivial topology in lattices is characterized by invariants—such as the Zak phase for one-dimensional (1D) lattices—derived from wave functions covering the Brillouin zone. We realize the 1D bipartite Rice-Mele (RM) lattice using ultracold 87Rb and focus on lattice configurations possessing …
Floquet Engineering Topological Dirac Bands
We experimentally realized a time-periodically modulated 1D lattice for ultracold atoms featuring a pair of linear bands, each with a Floquet winding number. These bands are spin-momentum locked and almost perfectly linear everywhere in the Brillouin zone: a near-ideal realization …
Combining machine learning with physics: A framework for tracking and sorting multiple dark solitons
In ultracold-atom experiments, data often comes in the form of images which suffer information loss inherent in the techniques used to prepare and measure the system. This is particularly problematic when the processes of interest are complicated, such as interactions …
Accurate Determination of Hubble Attenuation and Amplification in Expanding and Contracting Cold-Atom Universes
In the expanding universe, relativistic scalar fields are thought to be attenuated by “Hubble friction,” which results from the dilation of the underlying spacetime metric. By contrast, in a contracting universe this pseudofriction would lead to amplification. Here, we experimentally …
Dr. Shangjie Guo defends his thesis!
On this day, April 4, 2022, Shangjie Guo defended his thesis. Congratulations Shangjie!
Self-Bayesian aberration removal via constraints for ultracold atom microscopy
High-resolution imaging of ultracold atoms typically requires custom high numerical aperture (NA) optics, as is the case for quantum gas microscopy. These high NA objectives involve many optical elements, each of which contributes to loss and light scattering, making them …
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Feedback-stabilized dynamical steady states in the Bose-Hubbard model
The implementation of a combination of continuous weak measurement and classical feedback provides a powerful tool for controlling the evolution of quantum systems. In this paper, we investigate the potential of this approach from three perspectives. First, we consider a …
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