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MATériaux, InterfaceS, Surfaces, Environnement

Spin triplet states in 2D superconductors : theory and experimentsPost-doctorat de Cesare Tresca

Axe 4 - Dimensionnalité et confinement

Laboratoires co-porteurs

    Porteuse de projet : Matteo Calandra
    Encadrants : 
  • INSP
    Encadrants : Tristan Cren, Christophe Brun

Mots clés



Two-dimensional materials with spin-polarized surface states are promising candidates for spintronic applications. A first step in this direction, using strong Rashba spin-orbit coupling (SOC), has been made in some heavy-group atoms grown epitaxially on group IV surfaces, like β-Pb/Ge [Nat. Commun. 1, 17 (2010)] or Au/Si [Scie. Rep. 3, 1826 (2013)].

Surprisingly, in less dense 1/3 monolayer (ML) phases, until today in most studies the effects produced by SOC were overlooked while reversible phase transitions as a function of temperature were found [Nature 381, 398 (1996)], accompanied by magnetic orderings [Nat. Commun. 4, 1620 (2013), PRL 111, 106403 (2013)], metal-insulator transitions [PRL 96, 126103 (2006)] and also superconductivity [Nature Phys. 6, 104 (2010)]. Depending on the coverage and the substrate there are many possible reconstructions and related physical properties.

In these materials any tiny changes in coverage or substrate can determine completely different physical properties. Thus the study of these materials represent a topic of great interest for the variety of compounds, structures and characteristics they could exhibit.

In a recent work Verbitskiy and collaborators [2D Materials 3, 4 (2016)] studied a novel Ba decored graphene phase with BaC8 stoichiometry giving the experimental possibility to extend previous topics on graphene substrate.

To this arguments are related a lot of very interesting applications opening the way to the concrete possibility to explore novel exotic physical properties and also to develop new twodimensional spintronic devices, possibly using a well known technology such as the silicon (or graphene) one.

The present project will focus on a computational study of the structural, electronic, magnetic and possibly superconducting properties of heavy atoms on different substrates. The research will be strongly supported by experiments, in particular by scanning tunneling microscopy/spectroscopy (STM/STS).

Furthermore we are going to develop a theoretical tool to evaluate by first principles the quasiparticle interference (QPI) [Phys. Rev. B 57, R6858 (1998)] that can be measured by performing the Fourier transform of the the STS map [Applied Phys., 44, 464010 (2011)] (see Fig.1).

Fig.1: measured (b) and calculated (c) QPI map for 1/3ML Pb/Si(111).


  1. C. Tresca et al., Chiral Spin Texture in the Charge-Density-Wave Phase of the Correlated Metallic Pb/Si(111) Monolayer, Phys. Rev. Lett. 120, 196402 – Published 11 May 2018
    DOI :


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    MATISSE en chiffres

    • 4 disciplines : Chimie, Physique, Sciences de la Terre, Patrimoine
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