Research Overview

We investigate AMO (Atomic-Molecular-Optical) analogs of systems that fall under the general heading of quantum magnetism, where localized magnetic moments interact with one another and/or with mobile fermions. Important solid state systems in this class include the cuprate superconductors, heavy fermion materials, colossal magnetoresistive manganites, and geometrically frustrated magnetic…

An optical clock consists of two components, a laboratory radiation source and an atomic system with a natural reference frequency determined by quantum mechanics to which the laboratory radiation source can be compared. The laboratory radiation source is an ultra-stable cw laser. It acts as the local oscillator (or pendulum) for the clock and is used to probe an electromagnetic resonance in…

Topological states of matter are a particular class of non-Landau states, which are characterized by the notion of topological order. For example in the fractional quantum Hall effect, the topological order is directly responsible for the celebrated properties of fractional charge, anionic statistics and gapless chiral edge modes. A major reason for the current interest in topological states…

Taking advantage of the additional degrees of freedom in more complex quantum systems as knobs for control, manipulation and probing give rise to exciting new possibilities but at the cost of new mechanisms for loss and decoherence. For example recent work on ultra cold KRb molecules has already revealed that the molecular gas in the quantum regime can have a surprisingly large rate of…