We present a method for accurate determination of atomic transition matrix elements at the 10-3 level. Measurements of the ac Stark (light) shift around “magic-zero” wavelengths, where the light shift vanishes, provide precise constraints on the matrix elements. We make …
Precision Measurement of Transition Matrix Elements via Light Shift Cancellation Read more »
Motivated by the recent experimental success in realizing synthetic spin-orbit coupling in ultracold atomic systems, we consider N-component atoms coupled to a non-Abelian SU(N) gauge field. More specifically, we focus on the case, referred to here as “SU(3) spin-orbit-coupling,” where …
SU(3) Spin-Orbit Coupling in Systems of Ultracold Atoms Read more »
Karina received her Ph.D. and starts her postdoc in Ching Chin’s group at Chicago. Good luck Karina! In addition to participating in a range of experiments creating artificial gauge fields for cold atoms, Karina: lead our precision experiment measuring the …
Karina Jimenéz-García graduates and moves on to a postdoc! Read more »
We all wish Deep the best in his new Staff Scientist position at the National Physical Laboratory (NPL), New Delhi, India. During his tenure, Deep setup the now operating RbLi experiment on the University of Maryland campus, and lead our …
The coupling of the spin of electrons to their motional state lies at the heart of recently discovered topological phases of matter. Here we create and detect spin-orbit coupling in an atomic Fermi gas, a highly controllable form of quantum …
Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas Read more »
Interactions between particles can be strongly altered by their environment. We demonstrate a technique for modifying interactions between ultracold atoms by dressing the bare atomic states with light, creating an effective interaction of vastly increased range that scatters states of …
Synthetic Partial Waves in Ultracold Atomic Collisions Read more »
We have created a long-lived (≈40 s) persistent current in a toroidal Bose-Einstein condensate held in an all-optical trap. A repulsive optical barrier across one side of the torus creates a tunable weak link in the condensate circuit, which can affect …
Spin–orbit (SO) coupling—the interaction between a quantum particle’s spin and its momentum—is ubiquitous in physical systems. In condensed matter systems, SO coupling is crucial for the spin-Hall effect and topological insulators; it contributes to the electronic properties of materials such …
Yu-Ju Lin who has spent the past three years working on the artificial gauge fields project will be moving on to a permanent position at the Academia Sinica, Taiwan in November. We will miss you, and good luck!
Karina’s paper [Phys. Rev. Lett. 105, 110401 (2010)] featuring a fantastic measurement of the SF/MI phase transition in a 2D Bose-Hubbard system has been published in PRL. Our result is in agreement with QMC calculations with no adjustable parameters. This work …
Phases of a Two-Dimensional Bose Gas in an Optical Lattice Read more »