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@PHDTHESIS{Akal:414441,
      author       = {Akal, Ibrahim},
      othercontributors = {Moortgat-Pick, Gudrid and Ringwald, Andreas},
      title        = {{N}onperturbative vacuum pair creation in strong fields and
                      analogies in graphene},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2018-03957, DESY-THESIS-2018-030},
      series       = {DESY-THESIS},
      pages        = {313},
      year         = {2018},
      note         = {Dissertation, Universität Hamburg, 2018},
      abstract     = {In this thesis, nonperturbative pair creation from the
                      quantum field theoretic ground state in the presence of
                      strong macroscopic gauge fields is studied. Employing
                      different approaches such as the string inspired worldline
                      formalism, the worldline instanton method, semiclassical WKB
                      techniques as well as quantum kinetic theory, we investigate
                      various aspects of this so-called Schwinger effect. More
                      specifically, we study the explicit dependence of the pair
                      production rate on the underlying background structure.
                      Here, we mainly focus on purely time dependent as well as
                      spatiotemporal inhomogeneous and oscillatory electric
                      backgrounds which give rise to substantial enhancement
                      effects. Employing an effective reflection approach, we
                      analyze many properties and characteristic features of the
                      corresponding mechanisms. We also study the impact of
                      microscopic details of the background on nonperturbative and
                      perturbative aspects. Imposing explicit symmetry
                      constraints, we generalize the methods for multidimensional
                      backgrounds which facilitate the nonlocal nature of vacuum
                      pair production. In addition, we investigate analogous
                      effects in condensed matter systems such as bandgapped
                      graphene. Constructing appropriate descriptions in lower
                      dimensional spacetimes via Kaluza-Klein compactifications,
                      we find that creating quasiparticle-hole pairs in this Dirac
                      material resembles pair creation from the quantum vacuum by
                      the dynamical Schwinger mechanism.},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF3-611) / PHGS,
                      VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF3-611 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2018-03957},
      url          = {https://bib-pubdb1.desy.de/record/414441},
}