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Rapport d'activite 2017-2022

Production scientifique de J.P. Wittmer (1992-2022)

2022

Wittmer, J.P.; Semenov, A.N.; Baschnagel, J. (2022), Different types of spatial correlation functions for non-ergodic stochastic processes of macroscopic systems,European Physical Journal E,45(8) : link

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Meyer, H.; Benzerara, O.; Semenov, A.N. (2022), Theory of length-scale dependent relaxation moduli and stress fluctuations in glass-forming and viscoelastic liquids,Journal Of Chemical Physics,156(16) : link

2021

George, G.; Klochko, L.; Semenov, A.N.; Baschnagel, J.; Wittmer, J.P. (2021), Simple models for strictly non-ergodic stochastic processes of macroscopic systems,European Physical Journal E,44(10) : link

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Semenov, A.N. (2021), General relations to obtain the time-dependent heat capacity from isothermal simulations,Journal Of Chemical Physics,154(16) : link

George, G.; Klochko, L.; Semenov, A.N.; Baschnagel, J.; Wittmer, J.P. (2021), Fluctuations of non-ergodic stochastic processes,European Physical Journal E,44(4) : link

George, G.; Klochko, L.; Semenov, A.N.; Baschnagel, J.; Wittmer, J.P. (2021), Ensemble fluctuations matter for variances of macroscopic variables,European Physical Journal E,44(2) : link

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Semenov, A.N. (2021), Relaxation moduli of glass-forming systems: temperature effects and fluctuations,Soft Matter,17(34) : 7867-7892 link

2020

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Benzerara, O.; Ruscher, C.; Semenov, A.N. (2020), Composition fluctuations in polydisperse liquids: Glasslike effects well above the glass transition,Physical Review E,102(4) : link

2019

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Semenov, A.N. (2019), Relaxation dynamics in supercooled oligomer liquids: From shear-stress fluctuations to shear modulus and structural correlations,Journal Of Chemical Physics,151(5) : link

2018

George, G.; Kriuchevskyi, I.; Meyer, H.; Baschnagel, J.; Wittmer, J.P. (2018), Shear-stress relaxation in free-standing polymer films,Physical Review E,98(6) : link

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Semenov, A.N. (2018), Long-range stress correlations in viscoelastic and glass-forming fluids,Soft Matter,14(33) : 6835-6848 link

Kriuchevskyi, I.; Wittmer, J.P.; Meyer, H.; Benzerara, O.; Baschnagel, J. (2018), Shear-stress fluctuations and relaxation in polymer glasses,Physical Review E,97(1) : link

2017

Kriuchevskyi, I.; Wittmer, J.P.; Meyer, H.; Baschnagel, J. (2017), Shear Modulus and Shear-Stress Fluctuations in Polymer Glasses,Physical Review Letters,119(14) : link

Dolgushev, M.; Hauber, A.L.; Pelagejcev, P.; Wittmer, J.P. (2017), Marginally compact fractal trees with semiflexibility,Physical Review E,96(1) : link

Kriuchevskyi, I.; Wittmer, J.P.; Benzerara, O.; Meyer, H.; Baschnagel, J. (2017), Numerical determination of shear stress relaxation modulus of polymer glasses,European Physical Journal E,40(4) : link

Dolgushev, M.; Wittmer, J.P.; Johner, A.; Benzerara, O.; Meyer, H.; Baschnagel, J. (2017), Marginally compact hyperbranched polymer trees,Soft Matter,13(13) : 2499-2512 link

2016

Wittmer, J.P.; Kriuchevskyi, I.; Cavallo, A.; Xu, H.; Baschnagel, J. (2016), Shear-stress fluctuations in self-assembled transient elastic networks,Physical Review E,93(6) : link

Li, D.; Xu, H.; Wittmer, J.P. (2016), Glass transition of two-dimensional 80-20 Kob-Andersen model at constant pressure,Journal Of Physics-Condensed Matter,28(4) : link

Wittmer, J.P.; Xu, H.; Baschnagel, J. (2016), Simple average expression for shear-stress relaxation modulus,Physical Review E,93(1) : link

Baschnagel, J.; Meyer, H.; Wittmer, J.; Kulic, I.; Mohrbach, H.; Ziebert, F.; Nam, G.-M.; Lee, N.-K.; Johner, A. (2016), Semiflexible Chains at Surfaces: Worm-Like Chains and beyond,Polymers,8(8) : link

2015

Wittmer, J.P.; Kriuchevskyi, I.; Baschnagel, J.; Xu, H. (2015), Shear-strain and shear-stress fluctuations in generalized Gaussian ensemble simulations of isotropic elastic networks,European Physical Journal B,88(9) : link

Wittmer, J.P.; Xu, H.; Benzerara, O.; Baschnagel, J. (2015), Fluctuation-dissipation relation between shear stress relaxation modulus and shear stress autocorrelation function revisited,Molecular Physics,113(17-18, Si) : 2881-2893 link

Wittmer, J.P.; Xu, H.; Baschnagel, J. (2015), Shear-stress relaxation and ensemble transformation of shear-stress autocorrelation functions,Physical Review E,91(2) : link

2014

Johner, A.; Thalmann, F.; Baschnagel, J.; Meyer, H.; Obukhov, S.; Wittmer, J.P. (2014), Two-dimensional polymeric liquids and polymer stars: learning from conflicting theories,Journal Of Statistical Mechanics-Theory And Experiment,() : link

Polinska, P.; Gillig, C.; Wittmer, J.P.; Baschnagel, J. (2014), Hyperbranched polymer stars with Gaussian chain statistics revisited,European Physical Journal E,37(2) : link

Obukhov, S.; Johner, A.; Baschnagel, J.; Meyer, H.; Wittmer, J.P. (2014), Melt of polymer rings: The decorated loop model,Epl,105(4) : link

2013

Wittmer, J.P.; Xu, H.; Polinska, P.; Gillig, C.; Helfferich, J.; Weysser, F.; Baschnagel, J. (2013), Compressibility and pressure correlations in isotropic solids and fluids,European Physical Journal E,36(11) : 1-17 link

Wittmer, J.P.; Xu, H.; Polinska, P.; Weysser, F.; Baschnagel, J. (2013), Communication: Pressure fluctuations in isotropic solids and fluids,Journal Of Chemical Physics,138(19) : link

Wittmer, J.P.; Xu, H.; Polinska, P.; Weysser, F.; Baschnagel, J. (2013), Shear modulus of simulated glass-forming model systems: Effects of boundary condition, temperature, and sampling time,Journal Of Chemical Physics,138(12) : link

2012

Xu, H.; Wittmer, J.P.; Polinska, P.; Baschnagel, J. (2012), Impulsive correction to the elastic moduli obtained using the stress-fluctuation formalism in systems with truncated pair potential,Physical Review E,86(4, 2) : link

Schulmann, N.; Xu, H.; Meyer, H.; Polinska, P.; Baschnagel, J.; Wittmer, J.P. (2012), Strictly two-dimensional self-avoiding walks: Thermodynamic properties revisited,European Physical Journal E,35(9) : link

Farago, J.; Semenov, A.N.; Meyer, H.; Wittmer, J.P.; Johner, A.; Baschnagel, J. (2012), Mode-coupling approach to polymer diffusion in an unentangled melt. I. The effect of density fluctuations,Physical Review E,85(5, 1) : link

Schulmann, N.; Meyer, H.; Wittmer, J.P.; Johner, A.; Baschnagel, J. (2012), Interchain Monomer Contact Probability in Two-Dimensional Polymer Solutions,Macromolecules,45(3) : 1646-1651 link

2011

Wittmer, J.P.; Schulmann, N.; Polinska, P.; Baschnagel, J. (2011), Note: Scale-free center-of-mass displacement correlations in polymer films without topological constraints and momentum conservation,Journal Of Chemical Physics,135(18) : link

Wittmer, J.P.; Cavallo, A.; Xu, H.; Zabel, J.E.; Polinska, P.; Schulmann, N.; Meyer, H.; Farago, J.; Johner, A.; Obukhov, S.P.; Baschnagel, J. (2011), Scale-Free Static and Dynamical Correlations in Melts of Monodisperse and Flory-Distributed Homopolymers A Review of Recent Bond-Fluctuation Model Studies,Journal Of Statistical Physics,145(4) : 1017-1126 link

Schnell, B.; Meyer, H.; Fond, C.; Wittmer, J.P.; Baschnagel, J. (2011), Simulated glass-forming polymer melts: Glass transition temperature and elastic constants of the glassy state,European Physical Journal E,34(9) : link

Meyer, H.; Schulmann, N.; Zabel, J.E.; Wittmer, J.P. (2011), The structure factor of dense two-dimensional polymer solutions,Computer Physics Communications,182(9, Si) : 1949-1953 link

Wittmer, J.P.; Polinska, P.; Meyer, H.; Farago, J.; Johner, A.; Baschnagel, J.; Cavallo, A. (2011), Scale-free center-of-mass displacement correlations in polymer melts without topological constraints and momentum conservation: A bond-fluctuation model study,Journal Of Chemical Physics,134(23) : link

Lee, N.-K.; Farago, J.; Meyer, H.; Wittmer, J.P.; Baschnagel, J.; Obukhov, S.P.; Johner, A. (2011), Non-ideality of polymer melts confined to nanotubes,Epl,93(4) : link

2010

Wittmer, J.P.; Meyer, H.; Johner, A.; Kreer, T.; Baschnagel, J. (2010), Algebraic Displacement Correlation in Two-Dimensional Polymer Melts,Physical Review Letters,105(3) : link

Meyer, H.; Wittmer, J.P.; Kreer, T.; Johner, A.; Baschnagel, J. (2010), Static properties of polymer melts in two dimensions,Journal Of Chemical Physics,132(18) : link

Galuschko, A.; Spirin, L.; Kreer, T.; Johner, A.; Pastorino, C.; Wittmer, J.; Baschnagel, J. (2010), Frictional Forces between Strongly Compressed, Nonentangled Polymer Brushes: Molecular Dynamics Simulations and Scaling Theory,Langmuir,26(9) : 6418-6429 link

Wittmer, J.P.; Johner, A.; Cavallo, A.; Beckrich, P.; Crevel, F.; Baschnagel, J. (2010), Non-extensivity of the chemical potential of polymer melts,European Physical Journal E,31(3) : 229-237 link

Wittmer, J.P.; Johner, A.; Obukhov, S.P.; Meyer, H.; Cavallo, A.; Baschnagel, J. (2010), Distance Dependence of Angular Correlations in Dense Polymer Solutions,Macromolecules,43(3) : 1621-1628 link

2009

Wittmer, J.P.; Cavallo, A.; Kreer, T.; Baschnagel, J.; Johner, A. (2009), A finite excluded volume bond-fluctuation model: Static properties of dense polymer melts revisited,Journal Of Chemical Physics,131(6) : link

Meyer, H.; Kreer, T.; Aichele, M.; Cavallo, A.; Johner, A.; Baschnagel, J.; Wittmer, J.P. (2009), Perimeter length and form factor in two-dimensional polymer melts,Physical Review E,79(5) : link

2008

Meyer, H.; Wittmer, J.P.; Kreer, T.; Beckrich, P.; Johner, A.; Farago, J.; Baschnagel, J. (2008), Static Rouse modes and related quantities: Corrections to chain ideality in polymer melts,European Physical Journal E,26(1-2) : 25-33 link

2007

Wittmer, J.P.; Beckrich, P.; Crevel, F.; Huang, C.C.; Cavallo, A.; Kreer, T.; Meyer, H. (2007), Are polymer melts “ideal”?,Computer Physics Communications,177(1-2) : 146-149 link

Bayer, M.; Brader, J.M.; Ebert, F.; Fuchs, M.; Lange, E.; Maret, G.; Schilling, R.; Sperl, M.; Wittmer, J.P. (2007), Dynamic glass transition in two dimensions,Physical Review E,76(1, 1) : link

Wittmer, J.P.; Beckrich, P.; Meyer, H.; Cavallo, A.; Johner, A.; Baschnagel, J. (2007), Intramolecular long-range correlations in polymer melts: The segmental size distribution and its moments,Physical Review E,76(1, 1) : link

Beckrich, P.; Johner, A.; Semenov, A.N.; Obukhov, S.P.; Benoit, H.; Wittmer, J.P. (2007), Intramolecular form factor in dense polymer systems: Systematic deviations from the Debye formula,Macromolecules,40(10) : 3805-3814 link

Meyer, H.; Kreer, T.; Cavallo, A.; Wittmer, J.P.; Baschnagel, J. (2007), On the dynamics and disentanglement in thin and two-dimensional polymer films,European Physical Journal-Special Topics,141() : 167-172 link

Wittmer, J.P.; Beckrich, P.; Johner, A.; Semenov, A.N.; Obukhov, S.P.; Meyer, H.; Baschnagel, J. (2007), Why polymer chains in a melt are not random walks,Epl,77(5) : link

2006

Leonforte, F.; Tanguy, A.; Wittmer, J.P.; Barrat, J.-L. (2006), Inhomogeneous elastic response of silica glass,Physical Review Letters,97(5) : link

2005

Leonforte, F.; Boissiere, R.; Tanguy, A.; Wittmer, J.P.; Barrat, J.L. (2005), Continuum limit of amorphous elastic bodies. III. Three-dimensional systems,Physical Review B,72(22) : link

Cavallo, A.; Muller, M.; Wittmer, J.P.; Johner, A.; Binder, K. (2005), Single chain structure in thin polymer films: corrections to Flory’s and Silberberg’s hypotheses,Journal Of Physics-Condensed Matter,17(20) : 1697 link

2004

Leonforte, F.; Tanguy, A.; Wittmer, J.P.; Barrat, J.L. (2004), Continuum limit of amorphous elastic bodies II: Linear response to a point source force,Physical Review B,70(1) : link

Wittmer, J.P.; Meyer, H.; Baschnagel, J.; Johner, A.; Obukhov, S.; Mattioni, L.; Muller, M.; Semenov, A.N. (2004), Long range bond-bond correlations in dense polymer solutions,Physical Review Letters,93(14) : link

2003

Mattioni, L.; Wittmer, J.P.; Baschnagel, J.; Barrat, J.L.; Luijten, E. (2003), Dynamical properties of the slithering-snake algorithm: A numerical test of the activated-reptation hypothesis,European Physical Journal E,10(4) : 369-385 link

Klochko, L.; Baschnagel, J.; Wittmer, J.P.; Semenov, A.N. (), Relaxation moduli of glass-forming systems: temperature effects and fluctuations,Soft Matter,() : link