Dynamics of Tunneling Ionization using Bohmian Mechanics

Abstract

Recent attoclock experiments and theoretical studies regarding the strong-field ionization of atoms by few-cycle infrared pulses revealed new features that have attracted much attention. Here we investigate tunneling ionization and the dynamics of the electron probability using Bohmian Mechanics. We consider a one-dimensional problem to illustrate the underlying mechanisms of the ionization process. It is revealed that in the major part of the below-the-barrier ionization regime, in an intense and short infrared pulse, the electron does not tunnel \through" the entire barrier, but rather already starts from the classically forbidden region. Moreover, we highlight the correspondence between the probability of locating the electron at a particular initial position and its asymptotic momentum. Bohmian Mechanics also provides a natural definition of mean tunneling time and exit position, taking account of the time dependence of the barrier. Finally, we find that the electron can exit the barrier with significant kinetic energy, thereby corroborating the results of a recent study [Camus et al., Phys. Rev. Lett. 119 (2017) 023201].

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• Attosecond Ionization Time Delays in Strong-Field Physics
• Faithful realizations of semiclassical truncations
• Reconciling conflicting approaches for the tunneling time delay in strong field ionization
• Stochastic Bohmian mechanics within the Schrödinger-Langevin framework: A trajectory analysis of wave-packet dynamics in a fluctuative-dissipative medium
• Quantum interference in strong-field ionization by a linearly polarized laser pulse, and its relevance to tunnel exit time and momentum
• Canonical Tunneling Time in Ionization Experiments
• Electron correlation and short-range dynamics in attosecond angular streaking
• Attoscience in Phase Space
• The role of reflections in the generation of a time delay in strong field ionization
• Sub-barrier recollisions and the three classes of tunneling time delays in strong-field ionization
• Double-slit experiment revisited