Prof. Stefano Ruffo

Prof. Stefano RUFFO (born in 1954) got his "Laurea" in Physics from the University of Florence in 1977. After being a fellow of the National Institute of Nuclear Physics in Pisa, he obtained a permanent position as a researcher at the University of Pisa in 1981. In 1987 he became Associate Professor of Condensed Matter Physics at the University of Basilicata, and then moved to the University of Florence in 1991. His main field of research is nonlinear dynamics and statistical physics, specifically: Hamiltonian dynamics; cellular automata; coupled map lattices and spatio-temporal chaos; long-range interactions. He has studied applications of physics to biology: immune system, DNA models. He has published about 140 papers in peer reviewed international journals. He has visited several foreign institutions: Oxford University (UK), CPT-Marseille (FR), ENS-Lyon (FR), University of California at Berkeley (USA), Tokyo University (JP). He has been an advisor of several master and PhD thesis in Italy and abroad. He is a member of the Advisory Board of Physica A (Elsevier) and an Editor of Communications in Nonlinear Science and Numerical Simulations (Elsevier). He is a member of the C3 Commission (Statistical Physics) of the IUPAP (2008-2011).

Recent publications

[1] R. Bachelard, C. Chandre, D. Fanelli, X. Leoncini and S. Ruffo : "Abundance of regular orbits and out-of-equilibrium phase transitions in the thermodynamic limit for long-range systems", Physical Review Letters, (2008).

[2] A. Antoniazzi, D. Fanelli, S. Ruffo and Y.Y. Yamaguchi: "Nonequilibrium tricritical point in a system with long-range interactions", Physical Review Letters, 99, 040601 (2007).

[3] A. Antoniazzi, F. Califano, D. Fanelli, S. Ruffo: "Exploring the thermodynamic limit of Hamiltonian models: convergence to the Vlasov equation", Physical Review Letters, 98, 150602 (2007).

[4] R. Khomeriki, S. Ruffo and S. Wimberger: "Driven collective quantum tunneling of ultracold atoms in engineered optical lattices", Europhysics Letters, 77, 40005 (2007).

[5] R. Khomeriki, J. Leon, S. Ruffo:"Coexistence of Josephson oscillations and novel self-trapping regime in optical waveguide arrays", Physical Review Letters, 97, 143902 (2006). 

Selected conferences (invited)

-April 18-20 2007, Deterministic dynamics meets stochastic dynamics, The Erwin Schroedinger Institute for Mathematical Physics, Vienna, organized by C. Dellago, P. Hanggi and H. Kauffmann.

-June 4-8 2007, Chaos, Complexity and Transport: Theory and Applications, Marseille, organized by Cristel Chandre and Xavier Leoncini. -July 9-14 2007, STATPHYS23, Genova, organized by V. Loreto, L. Pietronero, and S. Zapperi.

-October 8-11 2007, Self-assembly of particles into longitudinal and transverse structures, Porquerolles, France, organized by R. Kaiser and Ph. Courteille.

-November 5-9 2007, Entropy production, transport, turbulence, Institut Henri Poincaré, Paris, organized by Henk van Beijeren.

-March 17-18 2008, Complexity and Statistical Mechanics, Academia Belgica, Roma.

-August 3-29 2008 Les Houches Summer School on Long-Range Interacting Systems, organized by T. Dauxois and S. Ruffo.

Teaching

-Mechanics and thermodynamics, 1^st year Computer Science (Eng.)

-Dynamical systems, 1^st year Master in Automation

-Introduction to chaos, PhD School in Nonlinear Dynamics and Complex Systems

e-mail: stefano.ruffo@unifi.it