Events at Physics |
Events on Thursday, April 2nd, 2009
- R. G. Herb Condensed Matter Seminar
- Nonequilibrium effects in single-channel and two-channel Kondo systems
- Time: 10:00 am
- Place: Chamberlin 5310
- Speaker: Aditi Mitra, New York University
- Abstract: It is now experimentally possible to realize both a single channel as well as a two channel Kondo system in nanoscale structures, opening up the possibility of studying the nonequilibrium properties of these systems. After a brief review of the experiments, I will present theoretical results for the effect of current flow on a single channel Kondo system, and the effect of a sudden quench on a two channel Kondo system. For voltages smaller than the Kondo temperature, the single channel Kondo system shows behavior consistent with a weakly perturbed Fermi liquid. On the other hand what makes a two channel Kondo system interesting is that it is one of the simplest examples of a non-Fermi liquid. It will be shown how this non-Fermi liquid behavior affects the time evolution of the system after a quench.
- Host: Maxim Vavilov
- NPAC (Nuclear/Particle/Astro/Cosmo) Forum
- Echoes of Supersymmetry: Baryon Asymmetry, Relic Q-balls, and Gravity Waves
- Time: 4:00 pm
- Place: 4274 Chamberlin
- Speaker: Alex Kusenko, UCLA
- Abstract: If supersymmetry is realized in nature, even at some very high energy scales, it has important cosmological consequences. A generic prediction of supersymmetry is the flat directions in the potential, along which a scalar condensate can form at the end of inflation. This condensate is generically unstable; its evolution and its fragmentation into Q-balls can generate the baryon asymmetry, dark matter, and the gravity waves that can be observed by upcoming detectors.
- Host: M J Ramsey-Musolf