Department of Physics

Indian Institute Of Technology Madras , Chennai

Short Time Spans in Ultrafast Science

Speaker : Prof. Jan M. Rost, Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.

2016-03-16

Abstract :

Attosecond Science and increasingly ultrafast X-ray science has been changing our perspective on microscopic phenomena on the scale of bound electron motion. Recent debates concern attosecond time delays in photoionization and electron tunneling. These examples demonstrate the need for an understanding, which can only come from theoretical concepts beyond the solution of the time-dependent Schrödinger equation. They also illustrate the complementary aspect of attosecond light pulses: as a mean to time-resolve ultrashort processes and as a source of broadband coherent light.
This talk will focus on the time-resolving photo processes. How long does photoionization take? We will discuss the concepts behind the streaking measurements of XUV photoionization and the attoclock measurements of tunneling ionization and propose a concept quantum-classical fidelity, to determine ultrashort time spans.
In the last part of the talk we scrutinize time itself and ask why it has classical character, even in the Schrödinger equation.

ABOUT THE SPEAKER:

Prof. Rost received his PhD in Physics from the University of Freiburg, Germany in 1990. He then spent time in the US at both Harvard and the University of Washington before returning to Freiburg to complete his Habilitation in 1995. He was a fellow of the Institute for Advanced Studies, Berlin, studying the origin of time, before joining MPI for the Physics of Complex System, Dresden in 1999, where he is currently the Director. He is also the Professor for Theoretical Quantum Dynamics at TU Dresden. His research interests are the theory of excited quantum systems in the ultracold and ultrafast domains, with a focus on ultracold excitonic Rydberg physics. Highlights among the many scientific leadership roles undertaken by Prof. Rost are being the Editor-in-Chief of the Journal of Physics B and the Head of the Chemistry, Physics and Technology section of the Max Planck Society.

Key Speaker Prof. Jan M. Rost, Max Planck Institute for the Physics of Complex Systems, Dresden, Germany.
Guests None
Place S N Bose Hall (HSB 210)
Start Time 5:00 PM
Finish Time 6:00 PM
External Link https://physics.iitm.ac.in/colloquium/janrost_mar16.pdf