Author: Ian Spielman

Topological lattice using multi-frequency radiation

We describe a novel technique for creating an artificial magnetic field for ultracold atoms using a periodically pulsed pair of counter propagating Raman lasers that drive transitions between a pair of internal atomic spin states: a multi-frequency coupling term. In

Eliot Fenton: a UMD Undergraduate Researchers of the Year for 2018

UMD Senior Eliot Fenton (LEFT FRONT) was been selected for recognition as one of Maryland¹s ‘Undergraduate Researchers of the Year’ for 2018. So cool! After the awards ceremony we all went to town hall to celebrate! Eliot will be moving

A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab

We study the dynamics of a supersonically expanding, ring-shaped Bose-Einstein condensate both experimentally and theoretically. The expansion redshifts long-wavelength excitations, as in an expanding universe. After expansion, energy in the radial mode leads to the production of bulk topological excitations—solitons

ErNa Photo-op!

Pictured is the ErNa team: from left to right: Hector Sosa Martinez (Postdoc), Ian B. Spielman (collaborator), Gretchen K. Campbell (PI),  Avinash Kumar (pre-h. D), Madison Anderson (graduate student), Monica Gutierrez Galan (graduate student), and Swarnav Banik (graduate student).

Synthetic clock transitions via continuous dynamical decoupling

Decoherence of quantum systems due to uncontrolled fluctuations of the environment presents fundamental obstacles in quantum science. Clock transitions which are insensitive to such fluctuations are used to improve coherence, however, they are not present in all systems or for

Russell Anderson returns to his native land

After a very productive two month visit to the RbL lab at JQI, Russell Anderson of Monash University has returned home.  Thanks for a great time Russ!

Quantum phases of two-component bosons with spin-orbit coupling in optical lattices

Ultracold bosons in optical lattices are one of the few systems where bosonic matter is known to exhibit strong correlations. Here we push the frontier of our understanding of interacting bosons in optical lattices by adding synthetic spin-orbit coupling, and

Andkia Putra Ph.D. defends his thesis

On this the 17th of November, 2017, Andika Putra defended his thesis to be elevated to the status of Doctor of Philosophy. Congratulations Dr. Putra!

Strong-coupling phases of the spin-orbit-coupled spin-1 Bose-Hubbard chain: Odd-integer Mott lobes and helical magnetic phases

We study the odd-integer filled Mott phases of a spin-1 Bose-Hubbard chain and determine their fate in the presence of a Raman induced spin-orbit coupling which has been achieved in ultracold atomic gases; this system is described by a quantum

Kinetic theory of dark solitons with tunable friction

We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose-Einstein condensate coupled to a noninteracting Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the