My group studies how electron-electron interactions shape quantum matter in low dimensions, using electronic transport in graphene-based heterostructures. Our work follows three directions: one-dimensional channels, Coulomb screening, and Josephson junctions.

Basic information

  • Current position: Max Planck Research Group Leader (W2), Low-Dimensional Electronics, MPI for Solid State Research, Stuttgart, Germany
  • Contact Information
    • Office: +49 711 689-1775
    • E-mail: j.barrier@fkf.mpg.de
    • Mailing address:
         Max-Planck-Institut für Festkörperforschung
         Heisenbergstraße 1
         70569 Stuttgart, Germany

Latest blog posts

Recent publications

  1. M. M. Al Ezzi, N. Xin, Y. Shi, S. Xu, J. Barrier, A. Berdyugin, S. Bhattacharjee, A. Knothe, K. Watanabe, T. Taniguchi, V. Fal’ko, G. Vignale, A. K. Geim, S. Adam, K. S. Novoselov, and M. Kim, Continuous Correlated States and Dual-Flatness in a Moiré Heterostructure, (2026). [arXiv:2604.13958]
  2. R. Bertini, X. Wang, S. Slizovskiy, Z. Zheng, J. Barrier, C. Pizzo, R. Smeyers, K. Nowakowski, H. Agarwal, B. Jorissen, K. Watanabe, T. Taniguchi, M. V. Milosevic, L. Covaci, V. Fal’ko, P. Jarillo-Herrero, R. Krishna Kumar, and F. H. L. Koppens, Bandwidth-Limited Critical Currents in Electrically Tuneable Moiré Bands, (2026). [arXiv:2607.01056]
  3. S. Konyzheva, Z. Wu, J. Lourembam, N. Xin, A. I. Berdyugin, P. Kumaravadivel, J. Barrier, D. Domaretskiy, K. Watanabe, T. Taniguchi, A. K. Geim, and V. I. Fal’ko, Metal-Insulator Transition of Brown-Zak Fermions Realised in Graphene Superlattices, (2026).
  4. J. Barrier, L. Peng, 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]

Affiliation & Funding

Disclaimer: All views and opinions expressed on this blog are solely my own. They do not necessarily reflect those of any past or present employers, funding agencies, colleagues or organisations I have or had been affiliated with.