Biography

I am currently a Research Scientist at NEC Laboratories Europe in Heidelberg (personal webpage). There, I am located in the Intelligent Software Systems (ISS) group, working at the intersect of scientific computing, system platform, and machine learning.

Before joining NEC in 2022, I did my PhD in computational/statistical physics at the University of Leipzig (personal webpage), where I worked on simple but complex physical model systems. One focus was to come up with new methods to observe new physics. In between, I had a short stint at the University of Marburg, working within the bioinformatics group.

Publications

  1. H. Christiansen, S. Majumder, and W. Janke,
    Coarsening and Aging of Lattice Polymers: Influence of Bond Fluctuations,
    J. Chem. Phys. 147, 094902 (2017) [online] [arXiv:1708.03216 (cond-mat.soft)].

  2. S. Majumder, H. Christiansen, and W. Janke,
    Scaling Laws During Collapse of a Homopolymer: Lattice Versus Off-Lattice,
    J. Phys.: Conf. Ser. 955, 012008 (2018) [online]. [arXiv:1712.03083 (cond-mat.stat-mech)].

  3. H. Christiansen, S. Majumder, and W. Janke,
    Phase Ordering Kinetics of the Long-Range Ising Model,
    Phys. Rev. E99, 011301(R) (2019) [online] [arXiv:1808.10426 (cond-mat.stat-mech)].

  4. H. Christiansen, M. Weigel, and W. Janke,
    Accelerating Molecular Dynamics Simulations with Population Annealing,
    Phys. Rev. Lett. 122, 060602 (2019) [online] [arXiv:1806.06016 (physics.comp-ph)].

  5. S. Majumder, H. Christiansen, and W. Janke,
    Dissipative Dynamics of a Single Polymer in Solution: A Lowe-Andersen Approach,
    J. Phys.: Conf. Ser. 1163, 012072 (2019) [online] [arXiv:1810.08561 (cond-mat.soft)].

  6. W. Janke, H. Christiansen, and S. Majumder,
    Coarsening in the Long-Range Ising Model: Metropolis versus Glauber Criterion,
    Invited Plenary Talk at the International Conference on Computer Simulations in Physics and beyond (CSP2018), 14-27 September 2018, Moscow, Russia,
    J. Phys.: Conf. Ser. 1163, 012002 (2019) [online].

  7. H. Christiansen, M. Weigel, and W. Janke,
    Population Annealing Molecular Dynamics with Adaptive Temperature Steps,
    J. Phys.: Conf. Ser. 1163, 012074 (2019) [online].

  8. H. Christiansen, S. Majumder, M. Henkel, and W. Janke,
    Aging in the Long-Range Ising Model,
    Phys. Rev. Lett. 125, 180601 (2020) [online] [Supplemental Material online] [arXiv:1906.11815 (cond-mat.stat-mech)].

  9. S. Majumder, H. Christiansen, and W. Janke,
    Understanding Nonequilibrium Scaling Laws Governing Collapse of a Polymer,
    Invited Colloquium, Eur. Phys. J. B93, 142 (2020) [online] [arXiv:1910.03394 (cond-mat.stat-mech)].

  10. H. Christiansen, S. Majumder, and W. Janke,
    Zero-Temperature Coarsening in the 2D Long-Range Ising Model,
    Phys. Rev. E103, 052122 (2021) [online] [arXiv:2011.06098 (cond-mat.stat-mech)].

  11. H. Christiansen, M. Weigel, and W. Janke,
    Simulating Met-Enkephalin With Population Annealing Molecular Dynamics,
    in: Computer Simulation Studies in Condensed-Matter Physics XXXIII, eds. D.P. Landau, M. Bachmann, S.P. Lewis, and H.B. Schüttler, J. Phys.: Conf. Ser. 2241, 012006 (2022) [online] [arXiv:2005.00810 (cond-mat.soft)].

  12. F. Müller, H. Christiansen, and W. Janke,
    Phase-Separation Kinetics in the Two-Dimensional Long-Range Ising Model,
    Phys. Rev. Lett. 129, 240601 (2022) [online].

  13. F. Müller, H. Christiansen, S. Schnabel, and W. Janke,
    Fast, Hierarchical, and Adaptive Algorithm for Metropolis Monte Carlo Simulations of Long-Range Interacting Systems,
    Phys. Rev. X 13, 031006 (2023) [online] [arXiv:2207.14670 (physics.comp-ph, cond-mat.stat-mech)]

  14. P. Kuterba, H. Christiansen, Z. Danel, and W. Janke,
    Molecular dynamics simulations of the monomer density profiles of knotted ring polymer chains confined in a slit of two parallel walls with one attractive and another repulsive surface,
    J. Phys.: Conf. Ser. 2436, 012031 (2023) [online].

  15. D. Gessert, H. Christiansen, and W. Janke,
    Superdiffusion-Like Behavior in Zero-Temperature Coarsening of the d=3 Ising Model,
    Sci. Rep. 13, 13270 (2023) [online] [arXiv:2305.12161 (cond-mat.stat-mech physics.comp-ph)].

  16. W. Janke, H. Christiansen, and S. Majumder,
    The Role of Magnetization in Phase-Ordering Kinetics of the Two-Dimensional Short-Range and Long-Range Ising Model,
    Eur. Phys. J. Spec. Top. 232, 1693 (2023) [online].

  17. H. Christiansen, F. Errica, F. Alesiani,
    Self-Tuning Hamiltonian Monte Carlo for Accelerated Sampling,
    J. Chem. Phys. 159, 234109 (2023) [online] [arXiv:2309.13593].

  18. V. Zaverkin, D. Holzmüller, H. Christiansen, F. Errica, F. Alesiani, M. Takamoto, M. Niepert, J. Kästner,
    Uncertainty-biased molecular dynamics for learning uniformly accurate interatomic potentials,
    accepted for publication in npj Comput. Mater. (2024) [online] [arXiv:2312.01416] [Research Square].

  19. F. Errica, H. Christiansen, V. Zaverkin, T. Maruyama, M. Niepert, F. Alesiani,
    Adaptive Message Passing: A General Framework to Mitigate Oversmoothing, Oversquashing, and Underreaching,
    under review (2024) [arXiv:2312.16560].

  20. D. Gessert, H. Christiansen, W. Janke,
    Aging following a zero-temperature quench in the d=3 Ising model,
    Phys. Rev. E 109, 044148 (2024) [Publisher] [arXiv:2404.04214].