Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 10: Focus Session: Superconductivity in 2d-Materials and their Heterostructures
TT 10.3: Hauptvortrag
Dienstag, 6. September 2022, 10:30–11:00, H3
Supercurrent diode effect in few-layer NbSe2 — Lorenz Bauriedl1, Christian Bäuml1, Lorenz Fuchs1, Christian Baumgartner1, Nicolas Paulik1, Jonas M. Bauer1, Kai-Qiang Lin1, John M. Lupton1, Takashi Taniguchi2, Kenji Watanabe2, Christoph Strunk1, and •Nicola Paradiso1 — 1Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany — 2International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
Current rectifiers are devices which display a largely different resistance for the two opposite bias polarities. Recent seminal works on Rashba superconductors have demonstrated that a simultaneous breaking of time- and inversion-symmetry leads to supercurrent rectification, where for one direction the resistance is strictly zero. Owing to the symmetry of the Rashba spin-orbit interaction, the effect is controlled by the in-plane field. In this work, we report on a supercurrent diode effect in few layer-thick NbSe2 constrictions. As predicted by theory for valley Zeeman spin-orbit interaction (SOI), the observed supercurrent rectification is controlled by the out-of-plane field Bz. Remarkably, the in-plane field does play a role: it determines a preferred direction for the out-of-plane field, making the rectification effect asymmetric in Bz. Such asymmetry is in contrast to theory expectations for pure valley Zeeman spin-orbit. Instead, it points toward the presence of an additional Rashba SOI component in NbSe2.