Category: Group News

Tutorial: Synthetic gauge potentials for ultracold neutral atoms

Synthetic gauge fields for ultracold neutral atoms—engineered using the interaction between laser fields and the atoms’ internal ‘spin’ degrees of freedom—provide promising techniques for generating the large (synthetic) magnetic fields required to reach the fractional quantum Hall (FQH) limit in

Posted in Group News, Papers Published, RbK, Theory

Geometrical Pumping with a Bose-Einstein Condensate

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

Posted in Atomtronics, Group News, Papers Published, RbK

Rockville Science day with Troop 1097

The boys of Boy Scout troop 1097 helped Ian out and presented experiments ranging from magnetism to superconductivity at the 2016 Rockville Science day! In the photo, Michael and Camden are explaining an electromagnet and induced currents!

Posted in Group News

Celebration of: Magnetic phases of spin-1 spin–orbit-coupled Bose gases

The UMD team got together to celebrate our recent paper “Magnetic phases of spin-1 spin–orbit-coupled Bose gases;” for some reason we went to Town Hall a long-time College Park dive bar. Times were good! Ana, Erin and Dimi were in

Posted in Group News, RbLi

Original BEC Experiment in Gaithersburg: Vented!

The first Na BEC experiment in Gaithersburg was vented today.  This experiment has lead a long and happy life, first creating a Na BEC in 1998, then studying solitons, optical lattices, four-wave mixing, and more recently looking at atoms in

Posted in Group News

Rashba realization: Raman with RF

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

Posted in Atomtronics, Group News, Papers Published, RbLi

Magnetic phases of spin-1 spin–orbit-coupled Bose gases

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

Posted in Atomtronics, Group News, Papers Published, RbLi, Uncategorized

Interaction-driven exotic quantum phases in spin-orbit-coupled spin-1 bosons

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

Posted in Atomtronics, Group News, Papers Published, Theory

Feshbach enhanced s-wave scattering of fermions: direct observation with optimized absorption imaging

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

Posted in Atomtronics, Group News, Papers Published, RbK

Ryan Price flies the coop!

Ryan defended his thesis today. Rock out!

Posted in Group News, RbLi