Julien Barrier
Max Planck Research Group Leader
Low-Dimensional Electronics
MPI-FKF, Stuttgart
0000-0002-6484-2157
My group studies how electron-electron interactions shape quantum matter in low dimensions, using electronic transport in graphene-based heterostructures.
We are looking for PhD students and postdocs. See the announcement or get in touch.
Max Planck Research Group Leader (W2)
Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
j.barrier@fkf.mpg.de · +49 711 689-1775
CV (pdf) · Google Scholar · ORCID · Web of Science · arXiv · Awards & Funding
Research
- One-dimensional channels: ballistic channels along twist domain walls in bilayer graphene, with tunable interactions
- Coulomb screening: in-situ control of interaction strength in van der Waals heterostructures
- Josephson junctions: superconducting correlations in one-dimensional channels
Selected publications
- J. Barrier, L. Peng, C. De Beule, S. Xu, V. I. Fal’ko, K. Watanabe, T. Taniguchi, A. K. Geim, S. Adam, and A. I. Berdyugin, Coulomb Screening of Superconductivity in Magic-Angle Twisted Bilayer Graphene, Physical Review X 16, 031040 (2026). [arXiv:2412.01577] [DOI]
- D. Domaretskiy, Z. Wu, V. H. Nguyen, N. Hayward, I. Babich, X. Li, E. Nguyen, J. Barrier, K. Indykiewicz, W. Wang, R. V. Gorbachev, N. Xin, K. Watanabe, T. Taniguchi, L. Hague, V. I. Fal’ko, I. V. Grigorieva, L. A. Ponomarenko, A. I. Berdyugin, and A. K. Geim, Proximity Screening Greatly Enhances Electronic Quality of Graphene, Nature 644, 646 (2025). [arXiv:2507.21997] [DOI]
- K. Nowakowski, H. Agarwal, S. Slizovskiy, R. Smeyers, X. Wang, Z. Zheng, J. Barrier, D. Barcons Ruiz, G. Li, R. Bertini, M. Ceccanti, I. Torre, B. Jorissen, A. Reserbat-Plantey, K. Watanabe, T. Taniguchi, L. Covaci, M. V. Milosevic, V. Fal’ko, P. Jarillo-Herrero, K. Kumar, and F. H. L. Koppens, Single-Photon Detection Enabled by Negative Differential Conductivity in Moiré Superlattices, Science 389, 644 (2025). [arXiv:2505.13637] [DOI]
- J. Barrier, M. Kim, R. Krishna Kumar, N. Xin, P. Kumaravadivel, L. Hague, E. Nguyen, A. I. Berdyugin, C. Moulsdale, V. V. Enaldiev, J. R. Prance, F. H. L. Koppens, R. V. Gorbachev, K. Watanabe, T. Taniguchi, L. I. Glazman, I. V. Grigorieva, V. I. Fal’ko, and A. K. Geim, One-Dimensional Proximity Superconductivity in the Quantum Hall Regime, Nature 628, 741 (2024). [arXiv:2402.14451] [DOI] [PDF]
News
- Oct 2026 Released mesoscopy, an open-source GUI for mesoscopic physics experiments (announcement)
- Aug 2026 Coulomb screening of superconductivity in magic-angle graphene published in Physical Review X, with a Physics editorial feature
- Jul 2026 Invited talk on proximity screening, International Workshop on New Insights into Quantum Materials, Stuttgart (talks)
- Apr 2026 Started the Low-Dimensional Electronics group at MPI-FKF (announcement)
Affiliation
Disclaimer: all views and opinions expressed on this website are solely my own and do not necessarily reflect those of any past or present employer, funder or collaborator.