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
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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)].
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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)].
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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)].
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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)].
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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)].
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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].
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H. Christiansen, M. Weigel, and W. Janke,
Population Annealing Molecular Dynamics with
Adaptive Temperature Steps,
J. Phys.: Conf. Ser. 1163, 012074 (2019)
[online].
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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)].
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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)].
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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)].
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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)].
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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].
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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)]
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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].
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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)].
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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].
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H. Christiansen, F. Errica, F. Alesiani,
Self-Tuning Hamiltonian Monte Carlo for Accelerated Sampling,
J. Chem. Phys. 159, 234109 (2023)
[online]
[arXiv:2309.13593].
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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].
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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].
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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].