T. Cren

Air-stable subsurface two-dimensional hole gas with strong spin-orbit interaction in single layer Pt on Ge

Dan Wang, Thomas Perron, Etienne Barre, Stéphane Pons et autres

Two-dimensional hole gases (2DHGs) offer enhanced spin-orbit coupling and correlations, making them attractive for spintronic and quantum devices. Yet, most realizations require complex epitaxial structures and protective encapsulation, limiting their applicability.Here we show that a stable 2DHG emerges in Ge( 111) upon …

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Importance of accurately measuring LDOS maps using scanning tunneling spectroscopy in materials presenting atom-dependent charge order: The case of the correlated Pb/Si(111) single atomic layer

Cesare Tresca, Tobias Bilgeri, Gerbold C. Ménard, V. Cherkez et autres

We address here general issues and show how to properly extract the local charge order in two-dimensional systems from scanning tunneling microscopy/spectroscopy (STM/STS) measurements. When the charge order presents spatial variations at the atomic scale inside the unit cell and is energy …

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On the importance of measuring accurately LDOS maps using scanning tunneling spectroscopy in materials presenting atom-dependent charge order: the case of the correlated Pb/Si(111) single atomic layer

Cesare Tresca, T. Bilgeri, Gerbold C. Ménard, V. Cherkez et autres

11 pages, 3 figures

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Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

P. Samuely, Pavol Szabó, Jozef Kačmarčík, Alain Meerschaut et autres

Extreme in-plane upper critical magnetic fields ${B}_{\mathrm{c}2//\mathrm{ab}}$ strongly violating the Pauli paramagnetic limit have been observed in the misfit layer ${(\mathrm{LaSe})}_{1.14}(\mathrm{Nb}{\mathrm{Se}}_{2})$ and ${(\mathrm{LaSe})}_{1.14}{(\mathrm{Nb}{\mathrm{Se}}_{2})}_{2}$ single crystals with ${T}_{\mathrm{c}}=1.23$ and 5.7 K, respectively. The crystals show a two-dimensional to three-dimensional transition at temperatures slightly …

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Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides

P. Samuely, A. Meerchaut, Laurent Cario, Aloysius G. M. Jansen et autres

Extreme in-plane upper critical magnetic fields $B_{c2//ab}$ strongly violating the Pauli paramagnetic limit have been observed in the misfit layer $(LaSe)_{1.14}(NbSe_2)$ and $(LaSe)_{1.14}(NbSe_2)_2$ single crystals with $T_c$ = 1.23 K and 5.7 K, respectively. The crystals show a two-dimensional to three-dimensional transition …

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Spectroscopic evidence for strong correlations between local superconducting gap and local Altshuler-Aronov density of states suppression in ultrathin NbN films

C. Carbillet, V. Cherkez, M. A. Skvortsov, Mikhail V. Feigel'man et autres

In metallic films, disorder localizes the electronic wave functions. A consequence is that electronic screening often diminishes. In this situation, a characteristic signature develops in the electronic density of states: a large depletion appears at the Fermi level, an effect predicted by …

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Spectroscopic evidence for strong correlations between local resistance and superconducting gap in ultrathin NbN films

C. Carbillet, V. Cherkez, M. A. Skvortsov, Mikhail V. Feigel'man et autres

Disorder has different profound effects on superconducting thin films. For a large variety of materials, increasing disorder reduces electronic screening which enhances electron-electron repulsion. These fermionic effects lead to a mechanism described by Finkelstein: when disorder combined to electron-electron interactions increases, there …

Chiral Spin Texture in the Charge-Density-Wave Phase of the Correlated Metallic Pb/Si(111) Monolayer

Cesare Tresca, Christophe Brun, Tobias Bilgeri, Gerbold C. Ménard et autres

We investigate the 1/3 monolayer α-Pb/Si(111) surface by scanning tunneling spectroscopy (STS) and fully relativistic first-principles calculations. We study both the high-temperature sqrt[3]×sqrt[3] and low-temperature 3×3 reconstructions and show that, in both phases, the spin-orbit interaction leads to an energy splitting as …

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Quasiparticle spectra of 2 H − NbSe 2 : Two-band superconductivity and the role of tunneling selectivity

Yves Noat, Jose Ángel Silva-Guillén, T. Cren, V. Cherkez et autres

We have studied the superconducting state of $2H\ensuremath{-}{\mathrm{NbSe}}_{2}$ by scanning tunneling spectroscopy along two different crystal orientations, the $c$ and the $a/b$ axes. Along the $c$ axis a large gap is dominant in the spectra, while a smaller gap is measured along …

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Remarkable effects of disorder on superconductivity of single atomic layers of lead on silicon

Christophe Brun, T. Cren, V. Cherkez, F. Debontridder et autres

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Proximity Effect between Two Superconductors Spatially Resolved by Scanning Tunneling Spectroscopy

V. Cherkez, Juan Carlos Cuevas, Christophe Brun, T. Cren et autres

How does a superconductor in contact with another through an atomic-scale junction influence the electronic properties in the latter? Investigating a submicron superconducting island of single-crystal Pb embedded in a pre-superconducting Pb crystalline monolayer, scientists reveal a giant region of induced superconductivity …

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Vortex Fusion and Giant Vortex States in Confined Superconducting Condensates

T. Cren, Lise Serrier-Garcia, F. Debontridder, Dimitri Roditchev

In a direct scanning tunneling spectroscopy experiment we address the problem of the quantum vortex phases in strongly confined superconductors. The strong confinement regime is achieved in in situ grown ultrathin single nanocrystals of Pb by tuning their lateral size to a …

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