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Marklund, Mattias
Publications (10 of 162) Show all publications
Gonoskov, I. & Marklund, M. (2016). Single-step propagators for calculation of time evolution in quantum systems with arbitrary interactions. Computer Physics Communications, 202, 211-215
Open this publication in new window or tab >>Single-step propagators for calculation of time evolution in quantum systems with arbitrary interactions
2016 (English)In: Computer Physics Communications, ISSN 0010-4655, E-ISSN 1879-2944, Vol. 202, p. 211-215Article in journal (Refereed) Published
Abstract [en]

We propose and develop a general method of numerical calculation of the wave function time evolution in a quantum system which is described by Hamiltonian of an arbitrary dimensionality and with arbitrary interactions. For this, we obtain a general n-order single-step propagator in closed-form, which could be used for the numerical solving of the problem with any prescribed accuracy. We demonstrate the applicability of the proposed approach by considering a quantum problem with non-separable time-dependent Hamiltonian: the propagation of an electron in focused electromagnetic field with vortex electric field component. 

Keywords
Single-step propagators, Quantum physics, Wave function evolution
National Category
Computational Mathematics Other Physics Topics
Identifiers
urn:nbn:se:umu:diva-120609 (URN)10.1016/j.cpc.2016.02.006 (DOI)000373542000014 ()
Available from: 2016-08-10 Created: 2016-05-18 Last updated: 2018-06-07Bibliographically approved
Heinzl, T., Harvey, C., Ilderton, A., Marklund, M., Bulanov, S. S., Rykovanov, S., . . . Leemans, W. P. (2015). Detecting radiation reaction at moderate laser intensities. Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, 91(2), Article ID 023207.
Open this publication in new window or tab >>Detecting radiation reaction at moderate laser intensities
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2015 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 91, no 2, article id 023207Article in journal (Refereed) Published
Abstract [en]

We propose a new method of detecting radiation reaction effects in the motion of particles subjected to laser pulses of moderate intensity and long duration. The effect becomes sizable for particles that gain almost no energy through the interaction with the laser pulse. Hence, there are regions of parameter space in which radiation reaction is actually the dominant influence on charged particle motion.

National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:umu:diva-102470 (URN)10.1103/PhysRevE.91.023207 (DOI)000350273900011 ()
Available from: 2015-05-19 Created: 2015-04-26 Last updated: 2018-06-07Bibliographically approved
Wallin, E., Gonoskov, A. & Marklund, M. (2015). Effects of high energy photon emissions in laser generated ultra-relativistic plasmas: Real-time synchrotron simulations. Physics of Plasmas, 22(3), Article ID 033117.
Open this publication in new window or tab >>Effects of high energy photon emissions in laser generated ultra-relativistic plasmas: Real-time synchrotron simulations
2015 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 22, no 3, article id 033117Article in journal (Refereed) Published
Abstract [en]

We model the emission of high energy photons due to relativistic charged particle motion in intense laser-plasma interactions. This is done within a particle-in-cell code, for which high frequency radiation normally cannot be resolved due to finite time steps and grid size. A simple expression for the synchrotron radiation spectra is used together with a Monte-Carlo method for the emittance. We extend previous work by allowing for arbitrary fields, considering the particles to be in instantaneous circular motion due to an effective magnetic field. Furthermore, we implement noise reduction techniques and present validity estimates of the method. Finally, we perform a rigorous comparison to the mechanism of radiation reaction, and find the emitted energy to be in excellent agreement with the losses calculated using radiation reaction. (C) 2015 AIP Publishing LLC.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-103169 (URN)10.1063/1.4916491 (DOI)000352163500081 ()
Available from: 2015-05-27 Created: 2015-05-18 Last updated: 2018-06-07Bibliographically approved
Harvey, C., Marklund, M. & Wallin, E. (2015). High-energy gamma-ray beams from nonlinear Thomson and Compton cattering in the ultra-intense regime. In: Jaroszynski, DA (Ed.), Relativistic plasma waves and particle beams as coherent and incoherent radiation sources: . Paper presented at Conference on relativistic plasma waves and particle beams as coherent and Incoherent radiation sources, APR 15-16, 2015, Prague, Czech Republic. , 9509, Article ID 950908.
Open this publication in new window or tab >>High-energy gamma-ray beams from nonlinear Thomson and Compton cattering in the ultra-intense regime
2015 (English)In: Relativistic plasma waves and particle beams as coherent and incoherent radiation sources / [ed] Jaroszynski, DA, 2015, Vol. 9509, article id 950908Conference paper, Published paper (Refereed)
Abstract [en]

We consider the Thomson and Compton scattering of high-energy electrons n an intense laser pulse. Our simulations show that energy losses due o radiation reaction cause the emitted radiation to be spread over a roader angular range than the case without these losses included. We xplain this in terms of the effect of these energy losses on the article dynamics. Finally, at ultra-high intensities, i.e. fields with dimensionless parameter a(0)similar to 200, the energy of the ission pectrum is significantly reduced by radiation reaction and also the lassical and QED results begin to differ. This is found to be due to he classical theory overestimating the energy loss of the electrons. uch findings are relevant to radiation source development involving e ext generation of high-intensity laser facilities.

Series
Proceedings of SPIE, ISSN 0277-786X
Keywords
nonlinear Compton scattering, ultra-intense lasers, strong field QED, diation reaction
National Category
Physical Sciences
Identifiers
urn:nbn:se:umu:diva-107103 (URN)10.1117/12.2179769 (DOI)000357641000003 ()978-1-62841-630-5 (ISBN)
Conference
Conference on relativistic plasma waves and particle beams as coherent and Incoherent radiation sources, APR 15-16, 2015, Prague, Czech Republic
Available from: 2015-08-19 Created: 2015-08-18 Last updated: 2018-06-07Bibliographically approved
Jukimenko, O., Modestov, M., Marklund, M. & Bychkov, V. (2015). Magnetic detonation structure in crystals of nanomagnets controlled by thermal conduction and volume viscosity. Physical Review B. Condensed Matter and Materials Physics, 91(9), Article ID 094428.
Open this publication in new window or tab >>Magnetic detonation structure in crystals of nanomagnets controlled by thermal conduction and volume viscosity
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 9, article id 094428Article in journal (Refereed) Published
Abstract [en]

Experimentally detected ultrafast spin avalanches spreading in crystals of molecular (nano) magnets [Decelle et al., Phys. Rev. Lett. 102, 027203 (2009)] have recently been explained in terms of magnetic detonation [Modestov et al., Phys. Rev. Lett. 107, 207208 (2011)]. Here magnetic detonation structure is investigated by taking into account transport processes of the crystals such as thermal conduction and volume viscosity. The transport processes result in smooth profiles of the most important thermodynamical crystal parameters, temperature, density, and pressure, all over the magnetic detonation front, including the leading shock, which is one of the key regions of magnetic detonation. In the case of zero volume viscosity, thermal conduction leads to an isothermal discontinuity instead of the shock, for which temperature is continuous while density and pressure experience jump. It is also demonstrated that the thickness of the magnetic detonation front may be controlled by applying the transverse-magnetic field, which is important for possible experimental observations of magnetic detonation.

National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-102360 (URN)10.1103/PhysRevB.91.094428 (DOI)000351875300002 ()
Available from: 2015-06-23 Created: 2015-04-23 Last updated: 2018-06-07Bibliographically approved
Gonoskov, A., Bashinov, A., Gonoskov, I., Harvey, C., Ilderton, A., Kim, A., . . . Sergeev, M. (2014). Anomalous radiative trapping in laser fields of extreme intensity. Physical Review Letters, 113, 014801
Open this publication in new window or tab >>Anomalous radiative trapping in laser fields of extreme intensity
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, p. 014801-Article in journal (Refereed) Published
Abstract [en]

We demonstrate that charged particles in a suciently intense standing wave are compressed toward, and oscillate synchronously at, the antinodes of the electric eld. We call this unusualbehaviour `anomalous radiative trapping' (ART). We show using dipole pulses, which oer a pathto increased laser intensity, that ART opens up new possibilities for the generation of radiationand particle beams, both of which are high-energy, directed and collimated. ART also provides a mechanism for particle control in high-intensity quantum-electrodynamics experiments.

Place, publisher, year, edition, pages
American Physical Society, 2014
Keywords
accelerators; plasma; physics
National Category
Physical Sciences
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-84244 (URN)10.1103/PhysRevLett.113.014801 (DOI)000338665200013 ()
Available from: 2013-12-19 Created: 2013-12-19 Last updated: 2018-06-08Bibliographically approved
diva2:752692
Open this publication in new window or tab >>Evolution of the magnetic field generated by the Kelvin-Helmholtz instability
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2014 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 21, no 7, p. 072126-Article in journal (Refereed) Published
Abstract [en]

The Kelvin-Helmholtz instability in an ionized plasma is studied with a focus on the magnetic field generation via the Biermann battery (baroclinic) mechanism. The problem is solved by using direct numerical simulations of two counter-directed flows in 2D geometry. The simulations demonstrate the formation of eddies and their further interaction and merging resulting in a large single vortex. In contrast to general belief, it is found that the instability generated magnetic field may exhibit significantly different structures from the vorticity field, despite the mathematically identical equations controlling the magnetic field and vorticity evolution. At later stages of the nonlinear instability development, the magnetic field may keep growing even after the hydrodynamic vortex strength has reached its maximum and started decaying due to dissipation.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2014
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:umu:diva-94168 (URN)10.1063/1.4891340 (DOI)000341154100028 ()
Available from: 2014-10-06 Created: 2014-10-06 Last updated: 2018-06-07Bibliographically approved
Jukimenko, O., Dion, C., Marklund, M. & Bychkov, V. (2014). Multidimensional instability and dynamics of spin-avalanches in crystals of nanomagnets. Physical Review Letters, 113(21), Article ID 217206.
Open this publication in new window or tab >>Multidimensional instability and dynamics of spin-avalanches in crystals of nanomagnets
2014 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 113, no 21, article id 217206Article in journal (Refereed) Published
Abstract [en]

We obtain a fundamental instability of the magnetization-switching fronts in superparamagnetic and ferromagnetic materials such as crystals of nanomagnets, ferromagnetic nanowires, and systems of quantum dots with large spin. We develop the instability theory for both linear and nonlinear stages. By using numerical simulations we investigate the instability properties focusing on spin avalanches in crystals of nanomagnets. The instability distorts spontaneously the fronts and leads to a complex multidimensional front dynamics. We show that the instability has a universal physical nature, with a deep relationship to a wide variety of physical systems, such as the Darrieus-Landau instability of deflagration fronts in combustion, inertial confinement fusion, and thermonuclear supernovae, and the instability of doping fronts in organic semiconductors.

Place, publisher, year, edition, pages
American Physical Society, 2014
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:umu:diva-96684 (URN)10.1103/PhysRevLett.113.217206 (DOI)000345745800012 ()25479521 (PubMedID)
Funder
Swedish Research Council
Available from: 2014-11-26 Created: 2014-11-26 Last updated: 2018-06-07Bibliographically approved
Kobyakov, D., Bezett, A., Lundh, E., Marklund, M. & Bychkov, V. (2014). Turbulence in binary Bose-Einstein condensates generated by highly nonlinear Rayleigh-Taylor and Kelvin-Helmholtz instabilities. Physical Review A. Atomic, Molecular, and Optical Physics, 89, 013631
Open this publication in new window or tab >>Turbulence in binary Bose-Einstein condensates generated by highly nonlinear Rayleigh-Taylor and Kelvin-Helmholtz instabilities
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2014 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 89, p. 013631-Article in journal (Refereed) Published
Abstract [en]

Quantum turbulence (QT) generated by the Rayleigh-Taylor instability in binary immiscible ultracold 87Rb atoms at zero temperature is studied theoretically. We show that the quantum vortex tangle is qualitatively different from previously considered superfluids, which reveals deep relations between QT and classical turbulence. The present QT may be generated at arbitrarily small Mach numbers, which is a unique property not found in previously studied superfluids. By numerical solution of the coupled Gross-Pitaevskii equations we find that the Kolmogorov scaling law holds for the incompressible kinetic energy. We demonstrate that the phenomenon may be observed in the laboratory.

Place, publisher, year, edition, pages
American Physical Society, 2014
Keywords
turbulence, Bose-Einstein condensation, ultracold gases, superfluids
National Category
Atom and Molecular Physics and Optics Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-85400 (URN)10.1103/PhysRevA.89.013631 (DOI)000335225700010 ()
Available from: 2014-02-03 Created: 2014-02-03 Last updated: 2018-06-08Bibliographically approved
Dion, C., Jukimenko, O., Modestov, M., Marklund, M. & Bychkov, V. (2013). Anisotropic properties of spin avalanches in crystals of nanomagnets. Physical Review B Condensed Matter, 87(1), Article ID 014409.
Open this publication in new window or tab >>Anisotropic properties of spin avalanches in crystals of nanomagnets
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2013 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 87, no 1, article id 014409Article in journal (Refereed) Published
Abstract [en]

Anisotropy effects for spin avalanches in crystals of nanomagnets are studied theoretically with the external magnetic field applied at an arbitrary angle to the easy axis. Starting with the Hamiltonian for a single nanomagnet in the crystal, two essential quantities characterizing spin avalanches are calculated: the activation and Zeeman energies. The calculation is performed numerically for a wide range of angles and analytical formulas are derived within the limit of small angles. The anisotropic properties of a single nanomagnet lead to anisotropic behavior of the magnetic deflagration speed. Modifications of the magnetic deflagration speed are investigated for different angles between the external magnetic field and the easy axis of the crystals. Anisotropic properties of magnetic detonation are also studied, which concern, first of all, the temperature behind the leading shock and the characteristic time of spin switching in the detonation.

Place, publisher, year, edition, pages
American Physical Society, 2013
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-63800 (URN)10.1103/PhysRevB.87.014409 (DOI)000313157100003 ()
Funder
Swedish Research Council
Available from: 2013-01-09 Created: 2013-01-07 Last updated: 2018-06-08Bibliographically approved
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