1 research outputs found
Large spatial extension of the zero-energy Yu-Shiba-Rusinov state in a magnetic field
Various promising qubit concepts have been put forward recently based on
engineered superconductor (SC) subgap states like Andreev bound states,
Majorana zero modes or the Yu-Shiba-Rusinov (Shiba) states. The coupling of
these subgap states via a SC strongly depends on their spatial extension and is
an essential next step for future quantum technologies. Here we investigate the
spatial extension of a Shiba state in a semiconductor quantum dot coupled to a
SC for the first time. With detailed transport measurements and numerical
renormalization group calculations we find a remarkable more than 50 nm
extension of the zero energy Shiba state, much larger than the one observed in
very recent scanning tunneling microscopy (STM) measurements. Moreover, we
demonstrate that its spatial extension increases substantially in magnetic
field.Comment: 11 pages, 7 figure