Subject：Non-adiabatic tunneling in strong laser fields
Speaker：Prof. Ingo Barth
Emcee：Prof. Jian Wu
Time：9:30am, 12th Mar, 2019
Place：Science Building A814
Abstract：
Tunneling is one of the most important mechanisms for ionization of atoms and molecules by strong laser fields, where the bound electron is freed via tunneling through a barrier formed by the Coulomb field and the electric field. Instead of being static, the infrared laser field oscillates periodically, resulting in a time-dependent barrier and thus making the tunneling a non-adiabatic process.
In this talk, the non-adiabatic effect in tunnel ionization induced by rotating laser fields is presented, including how it modifies the initial momentum drift of the tunneling wave packet at the tunnel exit, how it affects the tunneling rates of atomic/molecular orbitals that carry nonzero orbital angular momenta, how it deforms the current-carrying orbitals to control the ionization time drifts and to trigger the spatial separation of initially co- and counter-rotating photoelectrons, and its potential application in producing momentum-resolved and spatially separated spin-polarized photoelectrons.
References:
[1] I. Barth, O. Smirnova, Phys. Rev. A 84, 063415 (2011)
[2] K. Liu, I. Barth, Phys. Rev. A 94, 043402 (2016)
[3] K. Liu, K. Renziehausen, I. Barth, Phys. Rev. A 95, 063410 (2017)
[4] S. Eckart et al., Nat. Phys. 14, 701 (2018)
[5]K. Liu, H. Ni, K. Renziehausen, J.-M. Rost, I. Barth, Phys. Rev. Lett. 121, 203201 (2018)
[6]K. Liu et al., Phys. Rev. Lett. 122, 053202 (2019)
About the Speaker:
1983-1992: Albert-Gutzmann School for the Deaf, Berlin-East
1992-1996:Rheinisch-Westfalische School for the Deaf, Essen, allgemeine Hoschschulreife (general qualication for university entrance), grade point average 1.7, and certified physical technical assistant (PTA)
1996-2004: Technische Universitat Berlin, Physics, Prof. Dr. E. Sedlmayr, March 2004: Dipl.-Phys., passed with distinction, grade point average 1.0, Diploma thesis: Untersuchung anorganischer Schlusselreaktionen im astrophysikalischen Staubbildungsprozess (Investigation of anorganic key reactions in astrophysical dust formation process)
2004-2009: Freie Universitat Berlin, Physical and Theoretical Chemistry, Prof. Dr. J. Manz, June 2009: Dr. rer. nat., passed with distinction \summa cum laude, PhD thesis: Quantumcontrol of electron and nuclear circulations, ring currents, and induced magnetic elds in atoms, ions, and molecules by circularly polarized laser pulses
