Chip-Integrated Vortex Manipulation.

The positions of Abrikosov vortices have long been considered as means to encode classical information. Although it is possible to move individual vortices using local probes, the challenge of scalable on-chip vortex-control remains outstanding, especially when considering the demands of controlling multiple vortices. Realization of vortex logic requires means to shuttle vortices reliably between engineered pinning potentials, while concomitantly keeping all other vortices fixed.

Spectroscopy of NbSe Using Energy-Tunable Defect-Embedded Quantum Dots.

Quantum dots have sharply defined energy levels, which can be used for high resolution energy spectroscopy when integrated in tunneling circuitry. Here we report dot-assisted spectroscopy measurements of the superconductor NbSe, using a van der Waals device consisting of a vertical stack of graphene-MoS-NbSe. The MoS tunnel barriers host naturally occurring defects which function as quantum dots, allowing transport via resonant tunneling.

Quantum-dot assisted spectroscopy of degeneracy-lifted Landau levels in graphene.

Energy spectroscopy of strongly interacting phases requires probes which minimize screening while retaining spectral resolution and local sensitivity. Here, we demonstrate that such probes can be realized using atomic sized quantum dots bound to defects in hexagonal Boron Nitride tunnel barriers, placed at nanometric distance from graphene. With dot energies capacitively tuned by a planar graphite electrode, dot-assisted tunneling becomes highly sensitive to the graphene excitation spectrum.