Current takes a surprising path in quantum material

Physics

By | David Nutt , Cornell Chronicle

8/3/2023

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long plank with smaller arms coming off it and a long rod of metal with a loop at the end suspended over it — Matt Ferguson Schematic of a SQUID pickup loop imaging stray magnetic fields above a Hall bar sample of dimensions 200 × 75 μm2.

Provided. This image schematically shows the measurement principle. A flake of an atomically thin superconductor (shown in purple) on a substrate is patterned into a disk and covered by a spin-coated ionic gel. The pickup loop of the magnetic probe (shown in silver), with a concentric field coil (shown in dark gray) is approached to the sample. A current in the field coil produces a magnetic field, which results in an opposing screening current in the superconducting sample. The strength of the screening current is

Physics

Magnetic imaging unlocks crucial property of 2D superconductor

5/1/2023 Cornell Chronicle

Davis lab/provided This composite image shows where the selenium atoms reside in the crystal of niobium diselenide, a transition metal dichalcogenide, using conventional scanned tunneling microscopy (left, in grey) and where the electron pairs are observed using scanned Josephson tunneling microscopy (right, in blue).