Publikationsliste Szpak

    2025

  • Litzba, Lukas; Kleinherbers, Eric; König, Jürgen; Schützhold, Ralf; Szpak, Nikodem
    Effective time-dependent temperature for fermionic master equations beyond the Markov and the secular approximations
    In: Physical Review B, Jg. 111, 2025, Nr. 8, 085103
    DOI, Online Volltext (Open Access)

    • 2024

  • Szpak, Nikodem; Schaller, Gernot; Schützhold, Ralf; König, Jürgen
    Relaxation to persistent currents in a Hubbard trimer coupled to fermionic baths
    In: Physical Review B, Jg. 110, 2024, Nr. 11, 115131
    DOI, Online Volltext (Open Access)
  • Verlage, Jan; Queisser, Friedemann; Szpak, Nikodem; König, Jürgen; Kratzer, Peter; Schützhold, Ralf
    Quasi-particle Propagation Across Semiconductor–Mott Insulator Interfaces
    In: International Journal of Theoretical Physics, Jg. 63, 2024, Nr. 11, 285
    DOI (Open Access)

    • 2023

  • Kleinherbers, Eric; Stegmann, Thomas; Szpak, Nikodem
    Electronic transport in bent carbon nanotubes
    In: Physical Review B, Jg. 107, 2023, Nr. 19, 195424
    DOI, Online Volltext (Open Access)

    • 2022

  • Schaller, Gernot; Queisser, Friedemann; Szpak, Nikodem; König, Jürgen; Schützhold, Ralf
    Environment-induced decay dynamics of antiferromagnetic order in Mott-Hubbard systems
    In: Physical Review B, Jg. 105, 2022, Nr. 11, 115139
    DOI, Online Volltext (Open Access)
  • Ortiz, Walter; Szpak, Nikodem; Stegmann, Thomas
    Graphene nanoelectromechanical systems as valleytronic devices
    In: Physical Review B, Jg. 106, 2022, Nr. 3, 035416
    DOI, Online Volltext (Open Access)

    • 2021

  • Paredes-Rocha, Emmanuel; Betancur-Ocampo, Yonatan; Szpak, Nikodem; Stegmann, Thomas
    Gradient-index electron optics in graphene p-n junctions
    In: Physical Review B, Jg. 103, 2021, Nr. 4, 045404
    DOI, Online Volltext (Open Access)

    • 2020

  • Kleinherbers, Eric; Szpak, Nikodem; König, Jürgen; Schützhold, Ralf
    Relaxation dynamics in a Hubbard dimer coupled to fermionic baths : Phenomenological description and its microscopic foundation
    In: Physical Review B, Jg. 101, 2020, Nr. 12, 125131
    DOI, Online Volltext (Open Access)

    • 2019

  • Szpak, Nikodem; Schützhold, Ralf
    Time reversal and quantum Loschmidt echo in optical lattices
    2019
    Online Volltext (Open Access)
  • Stegmann, Thomas; Szpak, Nikodem
    Current splitting and valley polarization in elastically deformed graphene
    In: 2D Materials, Jg. 6, 2019, Nr. 1, S. 015024
    DOI, Online Volltext (Open Access)
  • Klar, Leonhard; Szpak, Nikodem; Schützhold, Ralf
    Quantum simulation of spontaneous pair creation in 2D optical lattices
    2019
    Online Volltext (Open Access)

    • 2016

  • Szpak, Nikodem; Kleinherbers, Eric; Dwedari, Magdulin; Korsten, Lennart
    Electronic transport in deformed nanotubes and in presence of magnetic field
    80. Jahrestagung der DPG und DPG-Frühjahrstagung, Regensburg, 6. - 11. März 2016,
    2016
    Online Volltext
  • Szpak, Nikodem
    The effects of curvature in deformed optical lattices
    DPG-Frühjahrstagung Hannover, 29. Februar - 4. März 2016,
    2016
    Online Volltext
  • Szpak, Nikodem; Stegmann, Thomas
    Current flow paths in deformed graphene: from quantum transport to classical trajectories in curved space
    Graphene Week 2016, Warsaw, Poland, 13/06/2016 - 17/06/2016,
    2016
    Online Volltext
  • Stegmann, Thomas; Szpak, Nikodem
    Current flow paths in deformed graphene : from quantum transport to classical trajectories in curved space
    In: New Journal of Physics (NJP), Jg. 18, 2016, Nr. 5, S. 053016
    DOI, Online Volltext (Open Access)

    • 2015

  • Szpak, Nikodem
    Quantum simulation of curvature in finite size optical lattices
    Institute of Physics, Atomic Optics Department, Jagellonian University, Cracow, Poland, Oct. 2015,
    2015
    Online Volltext
  • Szpak, Nikodem; Stegmann, Thomas
    Transport in deformed graphene: Magnetic field versus curvature
    79. Jahrestagung der DPG und DPG-Frühjahrstagung Berlin, 15. - 20. März 2015,
    2015
    Online Volltext
  • Linder, Malte; Schützhold, Ralf; Szpak, Nikodem; Sicking, Joachim; Schneider, Christian
    Pulse shape dependence in the dynamically assisted Sauter-Schwinger effect
    In: Physical Review D, Jg. 92, 2015, Nr. 8, S. 085009
    DOI, Online Volltext (Open Access)
  • Szpak, Nikodem
    Quantum simulation of curvature in finite size optical lattices
    DPG-Frühjahrstagung Heidelberg, 23. - 27. März 2015,
    2015
    Online Volltext
  • Szpak, Nikodem
    Transport Phenomena in Deformed Graphene: Magnetic Field vs Curvature
    Graphene Week 2015, Manchester, UK, 22 – 26 June 2015,
    2015
    Online Volltext

    • 2014

  • Szpak, Nikodem
    Curved spacetimes in the lab
    2014
    Online Volltext (Open Access)
  • Szpak, Nikodem
    Quantum simulation of relativistic quantum fields interacting with artificial gravity in 2D optical lattices
    78. Jahrestagung der DPG und DPG-Frühjahrstagung Berlin, 17. - 21. März 2014,
    2014
    Online Volltext
  • Sicking, Joachim; Schützhold, Ralf; Szpak, Nikodem
    Pulse shape dependence in the dynamically assisted Sauter-Schwinger effect
    78. Jahrestagung der DPG und DPG-Frühjahrstagung Berlin, 17. - 21. März 2014,
    2014
    Online Volltext
  • Szpak, Nikodem
    Quantum Transport in Deformed Graphene via Dirac Equation in Curved Space
    Graphene International Conference 2014, Toulouse, France, 6th - 9th of May 2014,
    2014
    Online Volltext
  • Szpak, Nikodem
    A Sheet of Graphene : Quantum Field in a Discrete Curved Space
    In: Relativity and gravitation: 100 years after Einstein in Prague / Bicak, Jiri; Ledvinka, Tomas (Hrsg.). Cham: Springer, 2014, S. 583 – 590
    DOI
  • Szpak, Nikodem
    Quantum simulation of relativistic fields interacting with artificial gravity in 2D optical lattices
    Physikzentrum Bad Honnef, workshop "Discrete and Analogue Quantum Simulators", Feb. 2014,
    2014
    Online Volltext
  • Szpak, Nikodem
    Quantum simulation of relativistic fields interacting with artificial gravity in 2D optical lattices
    Physikzentrum Bad Honnef, workshop "Discrete and Analogue Quantum Simulators", Feb. 2014,
    2014
    Online Volltext
  • Szpak, Nikodem
    Quantum simulation of relativistic fields interacting with artificial gravity in 2D optical lattices
    Physikzentrum Bad Honnef, workshop "Quo vadis BEC? V'", Dec. 2014,
    2014
    Online Volltext
  • Szpak, Nikodem
    Quantum Transport in Deformed Graphene vs Dirac Equation in Curved Space
    Graphene Week 2014, Gothenburg, Sweeden, 23-27 June,
    2014
    Online Volltext

    • 2013

  • Szpak, Nikodem
    Quantum simulation of curved spaces in optical lattices containing topological defects
    DPG-Frühjahrstagung Hannover, 18. - 22. März 2013,
    2013
    Online Volltext

    • 2012

  • Szpak, Nikodem; Schützhold, Ralf
    Optical lattice quantum simulator for quantum electrodynamics in strong external fields : spontaneous pair creation and the Sauter-Schwinger effect
    In: New Journal of Physics (NJP), Jg. 14, 2012, S. 035001
    DOI, Online Volltext (Open Access)
  • Szpak, Nikodem
    Optical lattice based quantum simulators for relativistic field theories
    DPG-Frühjahrstagung Stuttgart, 12. - 16. März 2012,
    2012
    Online Volltext
  • Szpak, Nikodem
    A sheet of graphene – quantum field in a discrete curved space
    raphene International Conference 2012, Brussels, 10-13 April 2012,
    2012
  • Szpak, Nikodem
    Optical lattice based quantum simulators for relativistic field theories
    ICAP 2012: 23rd International Conference on Atomic Physics, 23 Jul 2012 bis 27 Jul 2012,
    2012
    Online Volltext
  • Szpak, Nikodem
    The appearance of mass in discrete analog models: graphene and optical lattices
    Physikzentrum Bad Honnef, workshop "Strong interactions beyond the standard model", Feb. 2012,
    2012
    Online Volltext
  • Szpak, Nikodem
    A sheet of graphene - quantum fields in a discrete curved space
    Relativity and Gravitation – 100 Years after Einstein in Prague June 25 – 29, 2012, Prague, Czech Republic,
    2012
  • Szpak, Nikodem
    A sheet of graphene - quantum fields in a discrete curved space
    DPG-Frühjahrstagung Göttingen, 27. Februar - 2. März 2012,
    2012
    Online Volltext
  • Szpak, Nikodem
    Curvature, Defects, Geometry in Graphene and Optical Lattices
    Mini-Symposium on Graphene, Univ. Duisburg-Essen, Dec. 2012,
    2012
    Online Volltext

    • 2011

  • Szpak, Nikodem; Schützhold, Ralf
    Strong-field-QED analogue on the lattice
    75. Jahrestagung der DPG und DPG Frühjahrstagung Dresden, 13. - 18. März 2011,
    2011
    Online Volltext
  • Szpak, Nikodem
    Appearance of mass in lattice models
    Albert Einstein Institute (Max-Planck-Institute for Gravitational Physics) in Golm (Germany), April 2011,
    2011
  • Szpak, Nikodem
    Strong-field-QED effects in an optical lattice
    DPG Frühjahrstagung Karlsruhe, 28. März - 1. April 2011,
    2011
    Online Volltext
  • Bizon, Piotr; Chmaj, Tadeusz; Szpak, Nikodem
    Dynamics near the threshold for blowup in the one-dimensional focusing nonlinear Klein-Gordon equation
    In: Journal of Mathematical Physics, Jg. 52, 2011, Nr. 10, S. 103703
    DOI, Online Volltext (Open Access)
  • Szpak, Nikodem; Schützhold, Ralf
    Quantum simulator for the Schwinger effect with atoms in bichromatic optical lattices
    In: New Journal of Physics (NJP), Jg. 84, 2011, Nr. 5, 050101(R)
    DOI, Online Volltext (Open Access)

    • 2010

  • Szpak, Nikodem
    Asymptotics from Scaling for Nonlinear Wave Equations
    In: Communications in Partial Differential Equations, Jg. 35, 2010, Nr. 10, S. 1876 – 1890
    DOI, Online Volltext (Open Access)
  • Bieli, Roger; Szpak, Nikodem
    Global Pointwise Decay Estimates for Defocusing Radial Nonlinear Wave Equations
    In: Communications in Partial Differential Equations, Jg. 36, 2010, Nr. 2, S. 205 – 215
    DOI, Online Volltext (Open Access)
  • Bieli, Roger; Szpak, Nikodem
    Large data pointwise decay for defocusing semilinear wave equations
    2010
    Online Volltext (Open Access)
  • Szpak, Nikodem
    Late-time attractor for the cubic nonlinear wave equation
    In: Journal of Mathematical Physics, Jg. 51, 2010, Nr. 8, S. 082901
    DOI, Online Volltext (Open Access)

    • 2009

  • Szpak, Nikodem
    Comment on 'Late-time tails of a self-gravitating massless scalar field revisited'
    In: Classical and quantum gravity, Jg. 26, 2009, Nr. 24, S. 248001
    DOI, Online Volltext (Open Access)
  • Szpak, Nikodem
    Linear and nonlinear tails II : exact decay rates in spherical symmetry
    In: Journal of Hyperbolic Differential Equations (JHDE), Jg. 6, 2009, Nr. 1, S. 107 – 125
    DOI, Online Volltext (Open Access)

    • 2008

  • Szpak, Nikodem
    Linear and nonlinear tails I : general results and perturbation theory
    In: Journal of Hyperbolic Differential Equations (JHDE), Jg. 5, 2008, Nr. 4, S. 741 – 765
    DOI, Online Volltext (Open Access)
  • Szpak, Nikodem
    Spontaneous particle creation in time-dependent overcritical fields
    In: Journal of Physics A: Mathematical and Theoretical, Jg. 41, 2008, Nr. 16, S. 164059
    DOI, Online Volltext (Open Access)

    • 2007

  • Szpak, Nikodem
    Weighted-L∞ and pointwise space-time decay estimates for wave equations with potentials and initial data of low regularity
    2007
    Online Volltext (Open Access)
  • Szpak, Nikodem; Kleinherbers, Eric; Schützhold, Ralf; Stegmann, Thomas
    Current flow paths in deformed graphene and carbon nanotubes
    Current flow paths in deformed graphene and carbon nanotubes,
    2007
    Online Volltext
  • Szpak, Nikodem
    Simple proof of a useful pointwise estimate for the wave equation
    2007
    Online Volltext (Open Access)
  • Szpak, Nikodem
    Spontaneous particle creation within the external field approximation of QED
    In: Proceedings in Applied Mathematics and Mechanics: PAMM / Sixth International Congress on Industrial Applied Mathematics (ICIAM07) and GAMM Annual Meeting, 16-20 Juli 2007, Zürich, Jg. 7, 2007, Nr. 1, Special Issue: Sixth International Congress on Industrial Applied Mathematics (ICIAM07) and GAMM Annual Meeting, S. 1141401 – 1141402
    DOI

    • 2005

  • Marecki, Piotr; Szpak, Nikodem
    Spontaneous emission of light from atoms : the model
    In: Annalen der Physik, Jg. 14, 2005, Nr. 7, S. 428 – 437
    DOI, Online Volltext

    • 2004

  • Szpak, Nikodem
    Quasinormal mode expansion and the exact solution of the Cauchy problem for wave equations
    2004
    Online Volltext (Open Access)

    • 2003

  • Szpak, Nikodem
    On the problem of “spontaneous pair creation” in strong electric fields
    In: Nuclear instruments & methods in physics research, Jg. 2005, 2003, S. 30 – 35
    DOI

    • 2001

  • Szpak, Nikodem
    Relaxation to Intermediate Attractors in Nonlinear Wave Equations
    In: Relaxation to Intermediate Attractors in Nonlinear Wave Equations, Jg. 127, 2001, Nr. 3, S. 817 – 826
    DOI