Subject:：Electron dynamics in atomic systems interacting with a single-cycle pulse

Speaker：Dr. Baochun Yang（Department of Physics and Astronomy, Purdue University）

Time：3:00pm,17th Oct.,2016

Place:lecture hall,4F, Pinbiao Building of Institute，WIPM

About the speaker：

2014-present Postdoctoral research associate, Department of Physics and Astronomy, Purdue University

2008-2013 Ph.D. in Physics, Institute of Theoretical Physics, Chinese Academy of Sciences

2003-2007 B.S. in Physics, Shaanxi Normal University2016

Abstract:

The currently-ongoing experimental efforts have been pushing the available propagating electric-field pulse into the single-cycle limit.Some fundamental peculiarities are inherent in a single-cycle pulse,which are absent in the more usual multi-cycle pulses.Accordingly,the availability of the single-cycle pulse has been promising various applications in different physical systems.In this talk,we theoretically demonstrate some possible encouraging applications of a single-cycle pulse in controlling the electron dynamics in atomic systems.One can either use the single-cycle pulse to directly interact with atoms or use it to guide the electron dynamics in other atomic processes.For the former case,both the "displacement transition"and the"displacement ionization"are expected as a result of the non-zero integration of the particular vector potential associated with the single-cycle pulse.For the latter situation,we specifically consider the application of a single-cycle pulse in the photodetachment process of negative ions,where a temporal photodetachment microscopy can be expected in principle,as well as a precise control of the time-dependent photodetachment rate by identifying the closed classical orbits along which the electron returns to the anion center.