title: Relativistic features and time delay  of laser-induced tunnel-ionization
creator: Yakaboylu, Enderalp
subject: 500
subject: 500 Natural sciences and mathematics
subject: 530
subject: 530 Physics
description: Tunnel-ionization is investigated in the framework of relativistic quantum mechanics.  For an arbitrary constant electromagnetic field a gauge invariant energy  operator is introduced in order to identify the classically forbidden region for  tunnel-ionization. Furthermore, relativistic features of tunnel-ionization are explored.  A one-dimensional intuitive picture predicts that the ionized electron wave  packet in the relativistic regime experiences a momentum shift along the laser’s  propagation direction. This is shown to be consistent with the well-known strong  field approximation. Furthermore, spin dynamics in tunnel-ionization process  is discussed in the standard as well as in the dressed strong field approximation.  Next, the tunneling time delay is investigated for tunnel-ionization by extending  the definition of the Wigner time delay. Later, this concept is redefined in terms of  the phase of the fixed energy propagator. The developed formalism is applied to  the deep-tunneling and the near-threshold-tunneling regimes. It is shown that in  the latter case signatures of the tunneling time delay can be measurable at remote  distance. Finally, the path-dependent formulation of gauge theory is discussed. It  is demonstrated that this equivalent formulation of gauge theory leads to a canonical  gauge fixing, in which the Feynman path integral becomes more intuitive and  the calculation of the quasiclassical propagator is considerably simplified
date: 2014
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/16346/1/diss_yakaboylu.pdf
identifier: DOI:10.11588/heidok.00016346
identifier: urn:nbn:de:bsz:16-heidok-163465
identifier:   Yakaboylu, Enderalp  (2014) Relativistic features and time delay of laser-induced tunnel-ionization.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/16346/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng