Recent Submissions

  • Quantum kinetic perturbation theory for near-integrable spin chains with weak long-range interactions 

    Duval, Clement; Kastner, Michael (IOP Publishing, 2019)
    For a transverse-field Ising chain with weak long-range interactions we develop a perturbative scheme, based on quantum kinetic equations, around the integrable nearest-neighbour model. We introduce, discuss, and benchmark ...
  • X-Ray microcomputed tomography in additive manufacturing : a review of the current technology and applications 

    Du Plessis, Anton; Yadroitsev, Igor; Yadroitsava, Ina; Le Roux, Stephan G. (Mary Ann Liebert, Inc., 2018)
    X-ray microcomputed tomography (microCT) has become an established method of testing and analyzing additively manufactured parts in recent years, being especially useful and accurate for dimensional measurement and porosity ...
  • Universal equilibrium scaling functions at short times after a quench 

    Karl, Markus; Cakir, Halil; Halimeh, Jad C.; Oberthaler, Markus K.; Kastner, Michael; Gasenzer, Thomas (American Physical Society, 2017)
    By analyzing spin-spin correlation functions at relatively short distances,we showthat equilibrium near-critical properties can be extracted at short times after quenches into the vicinity of a quantum critical point. The ...
  • Scattering in a three-dimensional fuzzy space 

    Kriel, J. N.; Groenewald, H. W.; Scholtz, F. G. (American Physical Society, 2017)
    We develop scattering theory in a noncommutative space defined by an su(2) coordinate algebra. By introducing a positive operator valued measure as a replacement for strong position measurements, we are able to derive ...
  • Quantum effects in the cooperative scattering of light by atomic clouds 

    Pucci, Lorenzo; Roy, Analabha; Santo, Tiago Santiago do Espirito; Kaiser, Robin; Kastner, Michael; Bachelard, Romain (American Physical Society, 2017)
    Scattering of classical light by atomic clouds induces photon-mediated effective long-range interactions between the atoms and leads to cooperative effects even at low atomic densities. We introduce a simulation technique ...
  • Phases of dipolar bosons in a bilayer geometry 

    Cinti, Fabio; Wang, Daw-Wei; Boninsegni, Massimo (American Physical Society, 2017)
    We study, by first-principles computer simulations, the low-temperature phase diagram of bosonic dipolar gases in a bilayer geometry as a function of the two control parameters, i.e., the in-plane density and the ...
  • Noninvasive measurement of dynamic correlation functions 

    Uhrich, Philipp; Castrignano, Salvatore; Uys, Hermann; Kastner, Michael (American Physical Society, 2017)
    The measurement of dynamic correlation functions of quantum systems is complicated by measurement backaction. To facilitate such measurements we introduce a protocol, based on weak ancilla-system couplings, that is ...
  • Classical and quantum filaments in the ground state of trapped dipolar Bose gases 

    Cinti, Fabio; Boninsegni, Massimo (American Physical Society, 2017)
    We study, by quantum Monte Carlo simulations, the ground state of a harmonically confined dipolar Bose gas with aligned dipole moments and with the inclusion of a repulsive two-body potential of varying range. Two different ...
  • PT-symmetric waveguide system with evidence of a third-order exceptional point 

    Schnabel, Jan; Cartarius, Holger; Main, Jorg; Wunner, Gunter; Heiss, Walter Dieter (American Physical Society, 2017)
    An experimental setup of three coupled PT -symmetric waveguides showing the characteristics of a third-order exceptional point (EP3) has been investigated by Heiss and Wunner in an idealized model of three δ-function waveguides ...
  • Search for highly excited states in ²⁸Si 

    Montanari, D.; Courtin, S.; Jenkins, D. G.; Diget, C.; Yavuzkanat, N.; Neveling, R.; Mira, J. P.; Nemulodi, F.; Smit, F. D.; Usman, I.; Papka, P.; Swartz, J. A.; Van Zyl, J. J.; Orce, N. (IOP Publishing, 2017)
    The theoretical and experimental determination of superdeformed states in nuclei in the mass region A≤40 has been since a long time one of the major challenges of nuclear structure studies. Despite the considerable ...
  • Influence of nuclear cluster structure in proton-induced pre-equilibrium composite particle emission 

    Cowley, A. A. (IOP Publishing, 2017)
    Recent statistical multistep analyses of the pre-equilibrium reaction⁹³Nb(p, α) at incident energies of 65 and 100 MeV are reviewed. It is shown that the α-cluster structure of the target nucleus is prominently displayed ...
  • Examining the role of protein structural dynamics in drug resistance in Mycobacterium tuberculosis 

    Shaw, Daniel J.; Hill, Rachel E.; Simpson, Niall; Husseini, Fouad S.; Robb, Kirsty; Greetham, Gregory M.; Towrie, Michael; Parker, Anthony W.; Robinson, David; Hirst, Jonathan D.; Hoskisson, Paul A.; Hunt, Neil T. (Royal Society of Chemistry, 2017)
    Antimicrobial resistance represents a growing global health problem. The emergence of novel resistance mechanisms necessitates the development of alternative approaches to investigate the molecular fundamentals of resistance, ...
  • A pilot study investigating the presence of voids in bulk fill flowable composites 

    Mulder, R.; Mohammed, N.; Du Plessis, A.; Le Roux, S. G. (South African Dental Association, 2017)
    OBJECTIVE: To investigate the presence of voids in bulk fill flowable composites. METHODS: This study investigated two well-known bulk-fill flowable composites, Smart Dentin Replacement (SDR) (Dentsply/Caulk, Milford, ...
  • Vacuum polarization energy for general backgrounds in one space dimension 

    Weigel, H. (Elsevier, 2017)
    For field theories in one time and one space dimensions we propose an efficient method to compute the vacuum polarization energy of static field configurations that do not allow a decomposition into symmetric and anti-symmetric ...
  • Consistency between SU(3) and SU(2) covariant baryon chiral perturbation theory for the nucleon mass 

    Ren, Xiu-Lei; Alvarez-Ruso, L.; Geng, Li-Sheng; Ledwig, Tim; Meng, Jie; Vacas, M. J. Vicente (Elsevier, 2017)
    Treating the strange quark mass as a heavy scale compared to the light quark mass, we perform a matching of the nucleon mass in the SU(3) sector to the two-flavor case in covariant baryon chiral perturbation theory. The ...
  • Superfluid filaments of dipolar bosons in free space 

    Cinti, Fabio; Cappellaro, Alberto; Salasnich, Luca; Macri, Tommaso (American Physical Society, 2017)
    We systematically investigate the zero temperature phase diagram of bosons interacting via dipolar interactions in three dimensions in free space via path integral Monte Carlo simulations with a few hundreds of particles ...
  • Glass transitions in monodisperse cluster-forming ensembles : vortex matter in type-1.5 superconductors 

    Diaz-Mendez, Rogelio; Mezzacapo, Fabio; Lechner, Wolfgang; Cinti, Fabio; Babaev, Egor; Pupillo, Guido (American Physical Society, 2017)
    At low enough temperatures and high densities, the equilibrium configuration of an ensemble of ultrasoft particles is a self-assembled, ordered, cluster crystal. In the present Letter, we explore the out-of-equilibrium ...
  • Solving Dirac equations on a 3D lattice with inverse Hamiltonian and spectral methods 

    Ren, Z. X.; Zhang, S. Q.; Meng, J. (American Physical Society, 2017)
    A new method to solve the Dirac equation on a 3D lattice is proposed, in which the variational collapse problem is avoided by the inverse Hamiltonian method and the fermion doubling problem is avoided by performing spatial ...
  • Self-consistent relativistic quasiparticle random-phase approximation and its applications to charge-exchange excitations 

    Niu, Z. M.; Niu, Y. F.; Liang, H. Z.; Long, W. H.; Meng, J. (American Physical Society, 2017)
    The self-consistent quasiparticle random-phase approximation (QRPA) approach is formulated in the canonical single-nucleon basis of the relativistic Hatree–Fock–Bogoliubov (RHFB) theory. This approach is applied to study ...
  • Nuclear matrix element of neutrinoless double-β decay : relativity and short-range correlations 

    Song, L. S.; Yao, J. M.; Ring, P.; Meng, J. (American Physical Society, 2017)
    Background:The discovery of neutrinoless double-β (0νββ) decay would demonstrate the nature of neutrinos, have profound implications for our understanding of matter-antimatter mystery, and solve the mass hierarchy problem ...

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