Welcome to Physics
The University of Connecticut is consistently ranked the Number 1 Public University in New England. The University's first Physical Review article was published in 1899, and the first physics course was taught in 1918. The Department of Physics granted its first Ph.D. in 1954. One (so far) of the Department's Graduate Students, David M. Lee, went to receive a Nobel Prize in Physics.
The Department of Physics offers a wide range of graduate and undergraduate courses, as well as a vibrant research program with 29 full-time faculty.
Friday, April 28th, 2017
04:00 PM - 05:00 PM
Storrs CampusPhysics Building, Room PB-38
Dr. Jenny Hoffman
Imaging the Surface States of a Strongly Correlated Topological Insulator
The prediction and subsequent discovery of robust spin-polarized surface states on topological band insulators has launched a new subfield of physics over the last decade. In the last few years it has been recognized that when topology is combined with strong electron-electron correlations, even more interesting and potentially useful states of matter can arise, such as new topological classifications, fractionalized states, and many-body localization that preserves the topology of the insulating state against thermal destruction. Here I will give a general introduction to topological materials, and show the first direct proof of a strongly correlated topological insulator. Using scanning tunneling microscopy to probe real and momentum space structure, our measurements on the heavy fermion material SmB6 reveal the evolution of the insulating gap arising from strong interactions, and a surface state with Dirac point close to the chemical potential. Our observations present the first opportunity to explore a strongly correlated topological state of matter.
Monday, May 1st, 2017
01:00 PM - 03:00 PM
Storrs CampusPhysics Building, P121
Robert Dabrowski, Department of Physics, University of Connecticut
Adiabatic Expansion in Quantum Field Theory and Quantum
We consider the evolution of quantum field theoretical systems subject to a time-dependent perturbation and
demonstrate a universal form to the adiabatic particle number, corresponding to optimal truncation of the (divergent and asymptotic) adiabatic expansion. In this optimal basis, the particle number evolves smoothly in time according to the universal smoothing of adiabatic evolution in the Stokes Phenomenon, thus providing a well-defined notion for evolution through a non-equilibrium process. The optimal basis also clearly illustrates interference effects
associated with particle production for sequences of pulses in Schwinger and de Sitter particle production. We also demonstrate the basis dependence of the adiabatic particle number across several equivalent approaches, which revealed
that particle production is a measure of small deviations between the exact and adiabatic solutions of the
Ermakov-Milne equation for the associated time-dependent oscillators.
Tuesday, May 2nd, 2017
02:00 PM - 03:00 PM
Storrs CampusPhysics Building, P121
Renan Cabrera, Andre G. Campos, Denys I. Bondar, Princeton University
Control of relativistic wave packets through the Dirac equation and classical limit
The Dirac equation, one of the most famous equations in physics, is finding new applications beyond high energy physics. Nevertheless, the ability to find analytic solutions remains a difficult problem. Even more challenging, achieving quantum control requires time-dependent dynamics involving electric and magnetic fields obeying Maxwell's equations. In this talk we present a variety of exact solutions of the Dirac equation including the steering of coherent relativistic wave-packets and the corresponding classical limits. Additionally, we also present analytic solutions of the nonlinear Dirac equation.