Dear all
Please be informed about the following QSIT Seminar.
With best regards, Ilona Blatter --------------------------------------------------- Date: Monday April 11, 2011 Time: 11:00 Place: ETH Science City, HPF G 6 Host: Atac Imamoglu Neutral Fermions and Skyrmions in the Moore-Read state at ν= 5/2 Nigel Cooper University of Cambridge, U.K.
The fractional quantum Hall state at filling factor ν=5/2 is the subject of a great deal of experimental and theoretical interest at present. This arises from the belief that it is likely described by the Moore-Read state -- an exotic phase of quantum matter, the charged excitations of which are predicted to exhibit non-abelian exchange statistics. I shall describe the different excitations of the Moore- Read state, making connections to its interpretation as a paired state of composite fermions. I shall present the results of our numerical studies of the excitations of the ν=5/2 state. Our results establish the properties a "neutral fermion" branch of excitations.They further predict the existence of "Skyrmions" (spin-unpolarized charged excitations). I shall explain how evidence for neutral fermions and Skyrmions can be sought in photoluminescence experiments.
--------------------------------------------------- ETH Zurich Dr. Ilona Blatter QSIT Coordinator Laboratory for Solid State Physics HPF E 17 Schafmattstrasse 16 8093 Zurich
ilona.blatter@phys.ethz.ch www.nccr-qsit.ethz.ch
Phone: +41 44 633 36 06 Home: +41 44 844 42 50