There have been significant recent advances in realizing band structures with geometrical and topological features in experiments on cold atomic gases. This review summarizes these developments, beginning with a summary of the key concepts of geometry and topology for Bloch …
Gauge fields are ubiquitous in nature. In the context of quantum electrodynamics, you may be most familiar with the photon, which represents the gauge field mediating electromagnetic forces. But there are also gluons, which mediate strong forces, and the W …
Ian was one of eight faculty members in the University of Maryland’s College of Computer, Mathematical, and Natural Sciences are included on Clarivate Analytics’ 2018 list of Highly Cited Researchers, a compilation of influential names in science. https://cmns.umd.edu/news-events/features/4277
We trap individual 1D Bose gases and obtain the associated equation of state by combining calibrated confining potentials with in situ density profiles. Our observations agree well with the exact Yang–Yang 1D thermodynamic solutions under the local density approximation. We find that …
Equations of state from individual one-dimensional Bose gases Read more »
We describe a technique to emulate the dynamics of two-level PT-symmetric spin Hamiltonians, replete with gain and loss, using the unitary dynamics of a larger quantum system. The two-level system in question is embedded in a subspace of a four-level …
Perpetual emulation threshold of PT-symmetric Hamiltonians Read more »
Topological order is often quantified in terms of Chern numbers, each of which classifies a topological singularity. Here, inspired by concepts from high-energy physics, we use quantum simulation based on the spin degrees of freedom of atomic Bose-Einstein condensates to …
Second Chern number of a quantum-simulated non-Abelian Yang monopole Read more »
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 …
Topological lattice using multi-frequency radiation Read more »
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 …
Eliot Fenton: a UMD Undergraduate Researchers of the Year for 2018 Read more »
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 …
A Rapidly Expanding Bose-Einstein Condensate: An Expanding Universe in the Lab Read more »
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).