Dear Friends, Prof. Peter Schmelcher (Hamburg) is visiting ITAMP and will be giving a talk next Monday at 11 am, entitled "Patterned deposition and spontaneous formation of density waves in the non-equilibrium dynamics of spatio-temporally driven lattices". Please find the details and the abstract below. Hope to see you there, Misha -- Dr. Mikhail Lemeshko Institute for Theoretical Atomic, Molecular, and Optical Physics (ITAMP) Harvard-Smithsonian Center for Astrophysics MS-14 60 Garden St. Cambridge, MA 02138 U.S.A. mlemeshko(a)cfa.harvard.edu http://sites.google.com/site/mishalemeshko/ Tel. +1 (617) 496-7610 Fax +1 (617) 496-7668 ---------- Forwarded message ---------- From: Gonzalo Gonzalez Abad &lt;ggonzale(a)cfa.harvard.edu&gt; Date: Tue, Jun 11, 2013 at 2:53 PM Subject: Seminar by Prof. P. Schmelcher, "Patterned deposition and spontaneous formation of density waves...", Monday, June 17 To: Mikhail Lemeshko &lt;mikhail.lemeshko(a)gmail.com&gt; Please join us for a seminar sponsored by the Atomic and Molecular Physics Division, Harvard-Smithsonian Center for Astrophysics Complete schedule of AMP Seminars at http://www.cfa.harvard.edu/**amp/events.html<http://www.cfa.harvard.edu/… *** Please let me know if you will like to meet with our speaker *** 11:00 am, Monday, June 17, Phillips Auditorium Speaker: Prof. Peter. Schmelcher Zentrum für Optische Quantumtechnologien Universität Hamburg Title: "Patterned deposition and spontaneous formation of density waves in the non-equilibrium dynamics of spatio-temporally driven lattices" Abstract: We investigate the non-equilibrium classical dynamics and directed transport in lattices with a spatially-dependent driving. Prototype examples are phase, frequency or amplitude-modulated lattices which, via a tuning of the parameters of the driven unit cell, allow for an engineering of the classical phase space and therefore of the magnitude and direction of the directed currents. Several mechanisms for transient localization and trapping of particles in different wells of the driven unit cell are presented and analyzed. As a major first application we derive a mechanism for the patterned deposition of particles in a spatio-temporally driven lattice. The working principle is based on the breaking of the spatio-temporal translation symmetry, which is responsible for the equivalence of all lattice sites. The patterned trapping of the particles occurs in confined chaotic seas, created via the ramping of the height of the lattice potential. Complex density profiles on the length scale of the complete lattice can be obtained by a quasi-continuous, spatial deformation of the chaotic sea in a frequency modulated lattice. In a second step we explore spatio-temporal upper-lattices consisting of domains of differently time-driven spatial lattices. Here we demonstrate a novel mechanism for the conversion of ballistic to diffusive motion and vice versa. This process takes place at the interfaces of domains subjected to different time-dependent forces. As a consequence a complex short-time depletion dynamics at the interfaces followed by long-time transient oscillations of the particle density are observed. The latter can be converted to permanent density waves by an appropriate tuning of the driving forces. The proposed mechanism opens the perspective of an engineering of the non-equilibrium dynamics of particles in inhomogeneously driven lattices. -- -- Gonzalo Gonzalez Abad Atomic and Molecular Physics Division Harvard-Smithsonian Center for Astrophysics 60 Garden Street, MS 50, Cambridge, MA 02138 Phone: 617-496-7938 Email: ggonzalezabad(a)cfa.harvard.edu -- --