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 10.2: Hauptvortrag

Dienstag, 6. September 2022, 10:00–10:30, H3

Spin-orbit coupling and triplet pairing in mesoscopic superconductors — •marco aprili¹, marko kuzmanovic¹, tom dvir², david leboeuf³, stefan ilic⁴, menashe haim², maxim khodas², julia meyer⁴, hadar steinberg², and charis quay¹ — ¹Laboratoire de Physique des Solides, Bâtiment 510, Université Paris-Saclay 91405 Orsay, France — ²Racah Institute of Physics, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904 Israel — ³Laboratoire National des Champs Magnétiques Intenses, CNRS, Grenoble, France — ⁴Université Grenoble Alpes, CEA, Grenoble INP, 38000 Grenoble, France

The spin-orbit coupling which is present in in 2D materials because of inversion breaking symmetry allows a triplet component of the superconducting order parameter to appear.

In presence of an external magnetic field acting on the spin degree of freedom of the electron pairs forming the condensate, this spin-orbit coupling originates a spontaneous supercurrent and hence a phase difference. In a monolayer of a superconducting transition-metal-dichancogenides such as NbSe2, the lack of in-plane crystal inversion symmetry, results instead in a large valley Zeeman splitting which pins the spins out-of-plane and protects in fact superconductivity. Adding an external magnetic field results in a mix singlet-triplet superconducting state where the two order parameters are linearly coupled by the field. The triplet is an equal spin paring state. In this talk I'll present a series of quantum transport and tunneling spectroscopy experiments in mesoscopic superconductors that address these issues.