I am currently a Senior Research Scientist at NEC Laboratories Europe in Heidelberg, Germany (website).

Before joining NEC in 2022, I did my PhD in computational statistical physics at the University of Leipzig, Germany (website).

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].

  2. H. Christiansen, S. Majumder, and W. Janke,
    Phase Ordering Kinetics of the Long-Range Ising Model,
    Phys. Rev. E 99, 011301(R) (2019) [online] [arXiv:1808.10426].

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

  4. 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].

  5. S. Majumder, H. Christiansen, and W. Janke,
    Understanding Nonequilibrium Scaling Laws Governing Collapse of a Polymer,
    Eur. Phys. J. B 93, 142 (2020) [online] [arXiv:1910.03394].

  6. H. Christiansen, S. Majumder, and W. Janke,
    Zero-Temperature Coarsening in the 2D Long-Range Ising Model,
    Phys. Rev. E 103, 052122 (2021) [online] [arXiv:2011.06098].

  7. 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].

  8. 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]

  9. 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].

  10. 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].

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

  12. 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,
    npj Comput. Mater. 10, 83 (2024) [online] [arXiv:2312.01416] [Research Square].

  13. 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 at J. Mach. Learn. Res. (JMLR) (2024) [arXiv:2312.16560].

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

  15. S. Majumder, H. Christiansen, W. Janke,
    Temperature and Solvent Viscosity Tune the Intermediates During the Collapse of a Polymer,
    Macromolecules 57, 10586 (2024) [arXiv:2405.04813].

  16. D. Warkotsch, H. Christiansen, J. Zierenberg, W. Janke,
    Pulling on grafted flexible polymers can cause twisted bundles,
    Soft Matter 20, 4916 (2024) [online].

  17. V. Zaverkin, F. Alesiani, T. Maruyama, F. Errica, H. Christiansen, M. Takamoto, N. Weber, M. Niepert,
    Higher-Rank Irreducible Cartesian Tensors for Equivariant Message Passing,
    Adv. Neur. Inf. Proc. Sys. (NeurIPS), (2024) [arXiv:2405.14253].

  18. F. Müller, H. Christiansen, W. Janke,
    Non-universality of aging during phase separation of the two-dimensional long-range Ising model,
    Phys. Rev. Lett. 133, 237102 (2024) [online] [arXiv:2409.08050].

Conference Proceedings (Physics)

  1. 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].

  2. 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].

  3. W. Janke, H. Christiansen, and S. Majumder,
    Coarsening in the Long-Range Ising Model: Metropolis versus Glauber Criterion,
    J. Phys.: Conf. Ser. 1163, 012002 (2019) [online].

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

  5. H. Christiansen, M. Weigel, and W. Janke,
    Simulating Met-Enkephalin With Population Annealing Molecular Dynamics,
    J. Phys.: Conf. Ser. 2241, 012006 (2022) [online] [arXiv:2005.00810].

  6. 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].

  7. M. Conradi, H. Christiansen, S. Majumder, F. Müller, and W. Janke,
    Influence of Thermostats on the Dynamics of the Helix-Coil Transition,
    accepted for publication in Springer Proceedings in Physics (2024).