We consider ultracold atoms in a two-dimensional optical lattice of the dice geometry in a tight-binding regime. The atoms experience a laser-assisted tunneling between the nearest neighbor sites of the dice lattice accompanied by the momentum recoil. This allows one …
Abby defended her thesis titled “An apparatus for light-less artificial gauge fields and new imaging techniques” today. Way to go!
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 »
Dan defended this thesis titled “Engineered potentials in ultracold Bose-Einstein condensates” today. Way to go!
Spin-orbit coupling is an essential ingredient in topological materials, conventional and quantum-gas-based alike. Engineered spin-orbit coupling in ultracold-atom systems—unique in their experimental control and measurement opportunities—provides a major opportunity to investigate and understand topological phenomena. Here we experimentally demonstrate and …
Tunable Spin-Orbit Coupling via Strong Driving in Ultracold-Atom Systems Read more »
We theoretically explore atomic Bose–Einstein condensates (BECs) subject to position-dependent spin–orbit coupling (SOC). This SOC can be produced by cyclically laser coupling four internal atomic ground (or metastable) states in an environment where the detuning from resonance depends on position. …
Position-dependent spin–orbit coupling for ultracold atoms Read more »
Gauge fields are central in our modern understanding of physics at all scales. At the highest energy scales known, the microscopic universe is governed by particles interacting with each other through the exchange of gauge bosons. At the largest length …
The fourth year MURI review scheduled for Sep. 26; unlike the past two years this review will be a single-day review. Approximate times: starting at 9:00 AM on the 26th, and ending at 5:00 PM, followed by a 60 minute …
The ICAP 2014 Summer School held at The College of William and Mary in Williamsburg, VA was a great success with about 100 students attending the 18 lectures given by our fantastic speakers. Follow this link for lecture notes and …
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 »