2017/12/19 by Nicolas Douguet, Klaus Bartschat · 2 citations
Computer Science · Physics and Astronomy · #Atomic physics #Classical mechanics #Electron #Ionization #Kinetic energy #Laser-Matter Interactions and Applications #Momentum (technical analysis) #Physics #Position (finance) #Quantum Information and Cryptography #Quantum mechanics #Quantum tunnelling #Rectangular potential barrier #Spectroscopy and Quantum Chemical Studies #physics.atom-ph
paper · pdf · doi:10.1103/physreva.97.013402
published as Phys. Rev. A 97, 013402 (2018)
arxiv created 2017/12/19 · openalex publication_date 2018/01/08 · arxiv updated 2018/01/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Recent attoclock experiments and theoretical studies regarding the strong-field ionization of atoms by few-cycle infrared pulses revealed 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 starts already 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 [N. Camus et al., Phys. Rev. Lett. 119, 023201 (2017)].