Pandey, P. ; Kraft, R. ; Krupke, R. ; Beckmann, D. ; Danneau, R. (2019)
Andreev reflection in ballistic normal metal/graphene/superconductor junctions.
In: Physical Review B, 100 (16)
doi: 10.1103/PhysRevB.100.165416
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We report the study of ballistic transport in normal metal/graphene/superconductor junctions in edge-contactgeometry. While in the normal state, we have observed Fabry-Pérot resonances suggesting that charge carrierstravel ballistically, the superconducting state shows that the Andreev reflection at the graphene/superconductorinterface is affected by these interferences. Our experimental results in the superconducting state have beenanalyzed and explained with a modified Octavio-Tinkham-Blonder-Klapwijk model taking into account themagnetic pair-breaking effects and the two different interface transparencies,i.e.between the normal metaland graphene, and between graphene and the superconductor. We show that the transparency of the normalmetal/graphene interface strongly varies with doping at large scale, while it undergoes weaker changes at thegraphene/superconductor interface. When a cavity is formed by the charge transfer occurring in the vicinityof the contacts, we see that the transmission probabilities follow the normal state conductance highlighting theinterplay between the Andreev processes and the electronic interferometer.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2019 |
| Autor(en): | Pandey, P. ; Kraft, R. ; Krupke, R. ; Beckmann, D. ; Danneau, R. |
| Art des Eintrags: | Bibliographie |
| Titel: | Andreev reflection in ballistic normal metal/graphene/superconductor junctions |
| Sprache: | Englisch |
| Publikationsjahr: | 23 Oktober 2019 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 100 |
| (Heft-)Nummer: | 16 |
| DOI: | 10.1103/PhysRevB.100.165416 |
| URL / URN: | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.1... |
| Kurzbeschreibung (Abstract): | We report the study of ballistic transport in normal metal/graphene/superconductor junctions in edge-contactgeometry. While in the normal state, we have observed Fabry-Pérot resonances suggesting that charge carrierstravel ballistically, the superconducting state shows that the Andreev reflection at the graphene/superconductorinterface is affected by these interferences. Our experimental results in the superconducting state have beenanalyzed and explained with a modified Octavio-Tinkham-Blonder-Klapwijk model taking into account themagnetic pair-breaking effects and the two different interface transparencies,i.e.between the normal metaland graphene, and between graphene and the superconductor. We show that the transparency of the normalmetal/graphene interface strongly varies with doping at large scale, while it undergoes weaker changes at thegraphene/superconductor interface. When a cavity is formed by the charge transfer occurring in the vicinityof the contacts, we see that the transmission probabilities follow the normal state conductance highlighting theinterplay between the Andreev processes and the electronic interferometer. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Molekulare Nanostrukturen |
| Hinterlegungsdatum: | 20 Nov 2020 11:58 |
| Letzte Änderung: | 20 Nov 2020 11:58 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum