About The Speaker

Vanderlei S. Bagnato is a full professor in the Department of Physics and Materials Science at Brazil's University of Sao Paulo and the Institute of Physics of Sao Carlos. Prof. Bagnato is a world's leading expert in laser cooling, trapping neutral atoms, and applying the principles of optics and lasers in health sciences. Prof. Bagnato is a member of the National Academy of Sciences, the Pontifical Academy of Sciences of the Vatican, the World Academy of Sciences, the Brazilian Academy of Science. Prof. Bagnato is a Commander of Brazil's National Order of Scientific Merit and a faculty fellow of the Hagler Institute for Advanced Study at Texas A&M University.

Event Details

The notion of turbulence in the quantum world was conceived long ago, but the occurrence of turbulence in ultra cold gases has been studied in the laboratory only very recently. The topic offers new pathways and perspectives on the problem of turbulence. The finite size effects create specific characteristics observed. In this presentation we review the general properties of quantum gases at ultralow temperatures paying particular attention to vortices, their dynamics and turbulent behavior. Measurement of the energy spectrum using two techniques will be discussed and related to the present understanding of the theory. Identification of turbulence type based on energy spectrum determination will be explained. Applications of the turbulent cloud, when in expansion, with the creation of a matter wave speckle field will be demonstrated. The appearance of a exponential velocity distribution, as indicative of non thermalization effect, will can be interpreted in different views. Work supported by FAPESP ( program CEPID) and CNPq ( program INCT). Work with contribution from : P. Tavares, G. Telles, E. M. Gutierrez, K. Mgalhaes, G. Roati, A. Orozco, P. Mazo, G. Neto, A. Marino, M. Miotti, M. Hemmerling.