Quantum confinement and 2D systems – Remarkable quantum states in two dimensions



Christophe Brun, Tristan Cren, Pascal David, Marie d’Angelo, François Debontridder, Marie Hervé , Yves Noat


Two-dimensionality offers very rich possibilities to explore non-trivial quantum states by local probe spectroscopies. In line with the work opened up by the physics of graphene and topological insulators, we are studying the topological properties of materials produced in situ (topological insulators, Weyl semi-metals, topological superconductors). On the other hand, we also study the role of controlled magnetic and non-magnetic disorder, from the atomic or molecular scale up to larger mesoscopic scales, on two-dimensional superconductivity. Finally, we are also interested in model two-dimensional epitaxial systems where on-site Coulombic repulsion plays an important role. The techniques used in the laboratory are scanning tunneling microscopy/spectroscopy (STM/STS) coupled to an ultra-high vacuum growth chamber equipped with structural characterisation tools (LEED, Auger spectroscopy). We also use photoemission spectroscopy (ARPES,XPS), circularly polarised X-ray absorption spectroscopy (XMCD).


FigureIsolated MnPc molecules on an in-situ epitaxial Pb/Si(111) superconducting monolayer.

PhD students: Mathis Cameau, Mehdi Torkzadeh, Axel Malecot

Thesis defended: Gerbold Ménard (2016), Danilo Longo (2019), Raphaël Leriche (2019),



In France

  • LPS – Pascal Simon, Andrej Mesaros, Denis Jérôme
  • IMN – Laurent Cario
  • ENS: Marie-Laure Bocquet
  • CSNSM : Claire Marrache-Kikuchi.


  • Landau Institute in Russia – Mikhail Feigel’man, Mikhail Skvortsov, Igor Burmistrov
  • DIPC in San Sebastian: Nicolas Lorente
  • University of Sherbrooke in Canada: Claude Bourbonnais
  • KIT in Karlsruhe: Wulf Wulfhekel.



  • ANR MISTRAL (completed)
  • SUPERSTRIPES (completed)
  • GINET 2_0



  • Raphaël Leriche, Alexandra Palacio‐morales, Marco Campetella, Cesare Tresca, Shunsuke Sasaki, et al.. Misfit Layer Compounds: A Platform for Heavily Doped 2D Transition Metal Dichalcogenides. Advanced Functional Materials, Wiley, 2021, 31 (6), pp.2007706. ⟨10.1002/adfm.202007706⟩. ⟨hal-02993227⟩
  • Danilo Longo, Marie-Laure Bocquet, Nicolás Lorente, Hervé Cruguel, François Debontridder, et al.. Surface Phase Nucleation of Lead Monoatomic Layers on Si(111) Induced by Manganese Phthalocyanine Molecules. Journal of Physical Chemistry C, American Chemical Society, 2020, 124 (36), pp.19829-19840. ⟨10.1021/acs.jpcc.0c05278⟩. ⟨hal-03060013⟩
  • Vivien Perrin, Flávio L. n. Santos, Gerbold Ménard, Christophe Brun, Tristan Cren, et al.. Unveiling Odd-Frequency Pairing around a Magnetic Impurity in a Superconductor. Physical Review Letters, American Physical Society, 2020, 125 (11), ⟨10.1103/PhysRevLett.125.117003⟩. ⟨hal-03060020⟩
  • C. Carbillet, V. Cherkez, M. Skvortsov, M. Feigel’Man, F. Debontridder, et al.. Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density of states suppression in ultrathin NbN films. Physical Review B, American Physical Society, 2020, 102 (2), ⟨10.1103/PhysRevB.102.024504⟩. ⟨hal-03060011⟩
  • Gerbold Ménard, Andrej Mesaros, Christophe Brun, François Debontridder, Dimitri Roditchev, et al.. Isolated pairs of Majorana zero modes in a disordered superconducting lead monolayer. Nature Communications, Nature Publishing Group, 2019, 10 (1), pp.2587. ⟨10.1038/s41467-019-10397-5⟩. ⟨hal-03060026⟩
  • Gerbold Ménard, Christophe Brun, Raphaël Leriche, Mircea Trif, François Debontridder, et al.. Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111). The European Physical Journal. Special Topics, EDP Sciences, 2019, 227 (15-16), pp.2303-2313. ⟨10.1140/epjst/e2018-800056-3⟩. ⟨hal-02095315⟩
  • C. Tresca, C. Brun, T. Bilgeri, G. Menard, V. Cherkez, et al.. Chiral Spin Texture in the Charge-Density-Wave Phase of the Correlated Metallic Pb / Si ( 111 ) Monolayer. Physical Review Letters, American Physical Society, 2018, 120 (19), pp.196402. ⟨10.1103/PhysRevLett.120.196402⟩. ⟨hal-01792155⟩
  • Gerbold Ménard, Sébastien Guissart, Christophe Brun, Mircea Trif, François Debontridder, et al.. Two-dimensional topological superconductivity in Pb/Co/Si(111). Nature Communications, Nature Publishing Group, 2016, ⟨10.1038/s41467-017-02192-x⟩. ⟨hal-01400191v2⟩