Welcome

Welcome to my personal website. Please look around.

Turn animations on and off again.

Web apps

Most of this requires JavaScript and a mouse (no touchscreen).

• Tonbandfetzen
• Adsorbates on graphene (drag & drop)
• Mass-spring model of TMDCs
• Phonon renormalization
• Ball games (use arrow keys, catch stars, avoid ground)
• Slippery slopes (drag & drop)
• Color blender I
• Color blender II
• Color picker
• Patience
• Orbits
• Mandelbrot I (2 colors)
• Mandelbrot II (16 colors)
• Mandelbrot III (16777216 colors)
• Mandelbrot IV (16777216 colors)
• Grids
• Random art
• Forum
• Whiteboard
• Escher whiteboard

Codes

Please find some documentation here.

Bug reports and patches are welcome on Codeberg, GitHub, GitLab, Bitbucket, or via email.

• elphmod – Python modules for electron-phonon models [tar, md5]
• StoryLines – Line plots with Python & TikZ [tar, md5]
• Tonbandfetzen – Audio from plain text [tar, md5]
• makemake90 – Generate Makefiles for modular Fortran programs [tar, md5]
• ebmb – Solve multiband Eliashberg equations [tar, md5]
• ebbw – Solve finite-bandwidth Eliashberg equations [tar, md5]
• ris2bib – Convert bibliographies from RIS to BibTeX format [tar, md5]
• frettipy – No fretting about pretty Python [tar, md5]
• honeycombinations – Simulate adatoms on graphene [tar, md5]

Publications

The following can also be found on arXiv, ORCID, Zotero, Google Scholar, and Web of Science.

• T. P. van Waas, C. Berthod, J. Berges, N. Marzari, J. H. Dil, and S. Poncé, Extraction of the self-energy and Eliashberg function from angle-resolved photoemission spectroscopy using the xARPES code, arXiv:2508.13845 (2025)
• S. Buchberger, Y. in 't Veld, A. Rajan, P. A. E. Murgatroyd, B. Edwards, B. K. Saika, N. Kushwaha, M. H. Visscher, J. Berges, D. Carbone, J. Osiecki, C. Polley, T. Wehling, and P. D. C. King, Persistence of charge ordering instability to Coulomb engineering in the excitonic insulator candidate TiSe₂, arXiv:2506.01470 (2025)
• S. Enzner, J. Berges, A. Schobert, D. Oh, M. Kang, R. Comin, R. Thomale, T. O. Wehling, D. D. Sante, and G. Sangiovanni, Phonon fluctuation diagnostics: Origin of charge order in AV₃Sb₅ kagome metals, arXiv:2504.07883 (2025)
• C. van Efferen, L. Pätzold, T. Y. Tounsi, A. Schobert, M. Winter, Y. in 't Veld, M. Georger, A. Safeer, C. Krämer, J. Fischer, J. Berges, T. Michely, R. Mozara, T. Wehling, and W. Jolie, Inelastic tunneling into multipolaronic bound states in single-layer MoS₂, Phys. Rev. X 15, 031030 (2025), arXiv:2505.10972 [code & data]
• N. Girotto Erhardt, J. Berges, S. Poncé, and D. Novko, Understanding the origin of superconducting dome in electron-doped MoS₂ monolayer, npj 2D Mater. Appl. 9, 44 (2025), arXiv:2412.02822 [code & data, mos2cdw, mos2ebmb]
• A. Schobert, J. Berges, E. G. C. P. van Loon, M. A. Sentef, S. Brener, M. Rossi, and T. O. Wehling, Ab initio electron-lattice downfolding: Potential energy landscapes, anharmonicity, and molecular dynamics in charge density wave materials, SciPost Phys. 16, 046 (2024), arXiv:2303.07261 [code & data]
• T. Knispel, J. Berges, A. Schobert, E. G. C. P. van Loon, W. Jolie, T. Wehling, T. Michely, and J. Fischer, Unconventional charge-density-wave gap in monolayer NbS₂, Nano Lett. 24, 1045 (2024), arXiv:2307.13791 [code & data, nbs2cdw]
• J. Berges, N. Girotto, T. Wehling, N. Marzari, and S. Poncé, Phonon self-energy corrections: To screen, or not to screen, Phys. Rev. X 13, 041009 (2023), arXiv:2212.11806 [code & data, qe2screen]
• J. Berges, Toward a complete theory of crystal vibrations: Viewpoint on Phys. Rev. X 13, 031026 (2023), Physics 16, 151 (2023) [local version]
• B. Shao, X. Jiang, J. Berges, S. Meng, and B. Huang, Engineering interlayer hybridization in energy space via dipolar overlayers, Chin. Phys. Lett. 40, 087303 (2023), arXiv:2202.03882
• N. Witt, J. M. Pizarro, J. Berges, T. Nomoto, R. Arita, and T. O. Wehling, Doping fingerprints of spin and lattice fluctuations in moiré superlattice systems, Phys. Rev. B 105, L241109 (2022), arXiv:2108.01121
• C. van Efferen, J. Berges, J. Hall, E. van Loon, S. Kraus, A. Schobert, T. Wekking, F. Huttmann, E. Plaar, N. Rothenbach, K. Ollefs, L. M. Arruda, N. Brookes, G. Schönhoff, K. Kummer, H. Wende, T. Wehling, and T. Michely, A full gap above the Fermi level: The charge density wave of monolayer VS₂, Nat. Commun. 12, 6837 (2021), arXiv:2101.01140
• A. Schobert, J. Berges, T. Wehling, and E. van Loon, Downfolding the Su-Schrieffer-Heeger model, SciPost Phys. 11, 079 (2021), arXiv:2104.09207
• E. G. C. P. van Loon, J. Berges, and T. O. Wehling, Downfolding approaches to electron-ion coupling: Constrained density-functional perturbation theory for molecules, Phys. Rev. B 103, 205103 (2021), arXiv:2102.10072 [code & data]
• J. Berges, Many-body instabilities in two-dimensional materials, Dissertation, Universität Bremen (2020) [TeX, published version]
• J. Berges, E. G. C. P. van Loon, A. Schobert, M. Rösner, and T. O. Wehling, Ab initio phonon self-energies and fluctuation diagnostics of phonon anomalies: Lattice instabilities from Dirac pseudospin physics in transition metal dichalcogenides, Phys. Rev. B 101, 155107 (2020), arXiv:1911.02450 [code & data]
• J. Hall, N. Ehlen, J. Berges, E. van Loon, C. van Efferen, C. Murray, M. Rösner, J. Li, B. V. Senkovskiy, M. Hell, M. Rolf, T. Heider, M. C. Asensio, J. Avila, L. Plucinski, T. Wehling, A. Grüneis, and T. Michely, Environmental control of charge density wave order in monolayer 2H-TaS₂, ACS Nano 13, 10210 (2019)
• E. Kamil, J. Berges, G. Schönhoff, M. Rösner, M. Schüler, G. Sangiovanni, and T. O. Wehling, Electronic structure of single layer 1T-NbSe₂: Interplay of lattice distortions, non-local exchange, and Mott-Hubbard correlations, J. Phys. Condens. Matter 30, 325601 (2018), arXiv:1804.03898
• J. Berges, On the scope of McMillan’s formula, Master’s thesis, Universität Bremen (2016) [TeX, SciPost, GitHub]
• J. Berges, Phasen ladungsabhängiger Adsorbatstrukturen auf Graphen, Bachelor’s thesis, Universität Bremen (2014) [TeX, GitHub]

Texts

• Wanderer über dem Nebelmeer (10 October 2012)
• Freiheit ist Sklaverei (5 February 2012)
• Geister (18 November 2009)
• Unser Glück war nicht zu fassen (31 October 2009)
• Stumm (19 October 2009)

Links

• SoundCloud (some old music)
• Observation.org (heteroptera etc.)
• Jan Ole Peters (music, lyrics, etc.)

Contact

Jan Berges
28215 Bremen
Germany

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© 2025 Jan Berges. Where no other copyright or license is specified, this work is licensed under a Creative Commons Attribution 4.0 International License.