We realized a quantum geometric “charge” pump for a Bose-Einstein condensate (BEC) in the lowest Bloch band of a novel bipartite magnetic lattice [JQI writeup]. Topological charge pumps in filled bands yield quantized pumping set by the global—topological—properties of the …
Geometrical Pumping with a Bose-Einstein Condensate Read more »
We theoretically explore a Rashba spin–orbit coupling scheme which operates entirely in the absolute ground state manifold of an alkali atom, thereby minimizing all inelastic processes. An energy gap between ground eigenstates of the proposed coupling can be continuously opened …
Phases of matter are characterized by order parameters describing the type and degree of order in a system. Here we experimentally explore the magnetic phases present in a near-zero temperature spin-1 spin–orbit-coupled atomic Bose gas and the quantum phase transitions …
Magnetic phases of spin-1 spin–orbit-coupled Bose gases Read more »
We study the interplay between large-spin, spin-orbit coupling, and superfluidity for bosons in a two-dimensional optical lattice, focusing on the spin-1 spin-orbit-coupled system recently realized at the Joint Quantum Institute [Campbell et al., arXiv:1501.05984]. We find a rich quantum phase …
Interaction-driven exotic quantum phases in spin-orbit-coupled spin-1 bosons Read more »
We directly measured the normalized s-wave scattering cross-section of ultracold 40K atoms across a magnetic-field Feshbach resonance by colliding pairs of degenerate Fermi gases (DFGs) and imaging the scattered atoms. We extracted the scattered fraction for a range of bias …
We demonstrate that dynamical probes provide direct means of detecting the topological phase transition (TPT) between conventional and topological phases, which would otherwise be difficult to access because of loss or heating processes. We propose to avoid such heating by …
Dynamical Detection of Topological Phase Transitions in Short-Lived Atomic Systems Read more »
Bringing ultracold atomic gases into the quantum Hall regime is challenging. We engineered an effective magnetic field in a two-dimensional lattice with an elongated-strip geometry, consisting of the sites of an optical lattice in the long direction and of three …
The order parameter of a quantum-coherent many-body system can include a phase degree of freedom, which, in the presence of an electromagnetic field, depends on the choice of gauge. Because of the relationship between the phase gradient and the velocity, …
Gauge matters: observing the vortex-nucleation transition in a Bose condensate Read more »
Karina and Ian’s book chapter “The Mott Transition in a Bose Gas Measured Through Time of Flight” is published on page 145 of the “Annual Reviews of Cold atoms and Molecules” volume 2. Wow, it takes a long time for …
Karina and Ian’s book chapter on Mott/Superfluid physics published Read more »
Nathan Goldman et al‘s result describing techniques for measuring topology in a laser-coupled honeycomb lattice has been featured as a “Highlight of 2013” by The New Journal of Physics! This rocks! Highlights page: http://iopscience.iop.org/1367-2630/page/highlights-of-2013 Article: http://iopscience.iop.org/1367-2630/15/1/013025/article