Searcharxiv⌕ Search
Home/Archive/arXiv

arXiv · cond-mat/0612058

Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene

A. Shailos·W. Nativel·A. Kasumov·C. Collet·M. Ferrier·S. Gueron·R. Deblock·H. Bouchiat
View original source ↗Read source document ↗Export metadata ↓

Abstract

We have investigated electronic transport of few-layer-graphene (FLG) connected to superconducting electrodes. The device is prepared by mechanical exfoliation of graphite. A small mesa of FLG is placed on the surface of an insulating Alumina layer over silicon substrate, and is connected with two tungsten electrodes, separated by 2.5 microns, grown by focused ion beam. While tungsten electrodes are superconducting below 4 K, proximity induced superconductivity in FLG is observed below 1K with a large differential resistance drop at low bias. Signatures of multiple Andreev reflections are observed as peaks located at voltages corresponding to sub-multiple values of the superconducting gap of the electrodes.

Explore related subjects

cond-mat.mes-hall

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

A. Shailos, W. Nativel, A. Kasumov, C. Collet, M. Ferrier, S. Gueron, R. Deblock, H. Bouchiat. 2006-12-12. Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene. https://doi.org/10.1209/0295-5075%2F79%2F57008

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related papers

arXiv2026

Computational quantum transport: a scattering approach perspective

This review is devoted to the different techniques that have been developed to compute the phase-coherent transport properties of quantum nanoelectronic systems connected to electrodes. Beside a review of the different algorithms proposed in the literature, we provide a comprehensive and pedagogical derivation of the two formalisms on which these techniques are based: the scattering approach and the (nonequilibrium) Green's function approach. We show that the scattering problem can be formulated as a system of linear equations and that different existing algorithms for solving this scattering problem amount to different sequences of Gaussian elimination. We explicitly prove the equivalence of the two formalisms. We discuss the stability and numerical complexity of the existing methods. The review ends with a selection of a few applications where numerical calculations were instrumental in shaping our understanding of the physics.

cond-mat.mes-hall↗
arXiv2026

Curvature-stabilized three-dimensional spiral states and local-field nucleation of skyrmions on spherical caps

The combination of polystyrene particles and multilayers with chiral interfacial interactions offers an interesting platform to study the interplay between topology, chirality, and curvature. Here, we investigate Pt/Co/Ta multilayers sputtered onto self-assembled polystyrene particles with a diameter of 919 nm, which show a magnetic reversal distinctly different from that of planar films. Using non-invasive scanning transmission X-ray microscopy and in-vacuum magnetic force microscopy (MFM) with low-moment tips, we observe maze domains in the planar films, whereas the curvilinear films host three-dimensional spiraling stripe states. Repeated scanning with a conventional higher-moment MFM tip ruptures these spirals into metastable skyrmions at the top of the particles. Micromagnetic simulations of spherical caps reveal that increasing curvature renders a single spiral stripe energetically favorable over an isolated skyrmion, and that this stabilization is predominantly of magnetostatic origin. Our results identify the spiral states as intrinsic to the curvilinear geometry and the skyrmions as metastable states nucleated by local magnetic fields, underlining the value of non-invasive imaging to distinguish intrinsic curvature effects from probe-induced magnetic textures.

cond-mat.mes-hall↗
arXiv2026

Coherent control of spinmons

In this work, we explore a hybrid qubit device where quantum information is encoded by quantum states of a transmon entangled with the spin of a trapped Andreev quasiparticle. We term such devices spinmons. We lift the spinmon Kramers degeneracy by introducing a Zeeman field and develop two routes for full qubit control via electrostatic gates and an AC flux drive, providing multiple directions for experimental implementations. Finally, we compute coherence times, verify the qubit robustness against flux, charge and gate voltage noise sources, and discuss the role of nuclear spin noise.

cond-mat.mes-hall↗