4 papers
Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor
Damianos Chatzopoulos, Doohee Cho, Koen M. Bastiaans +7
By using scanning tunneling microscopy (STM) we find and characterize dispersive, energy-symmetric in-gap states in the iron-based superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{…
Imaging doubled shot noise in a Josephson scanning tunneling microscope
K. M. Bastiaans, D. Cho, D. Chatzopoulos +3
We have imaged the current noise with atomic resolution in a Josephson scanning tunneling microscope with a Pb-Pb junction. By measuring the current noise as a function of applied…
A strongly inhomogeneous superfluid in an iron-based superconductor
D. Cho, K. M. Bastiaans, D. Chatzopoulos +2
Among the mysteries surrounding unconventional, strongly correlated superconductors is the possibility of spatial variations in their superfluid density. We use atomic-resolution J…
Amplifier for scanning tunneling microscopy at MHz frequencies
K. M. Bastiaans, T. Benschop, D. Chatzopoulos +4
Conventional scanning tunneling microscopy (STM) is limited to a bandwidth of circa 1kHz around DC. Here, we develop, build and test a novel amplifier circuit capable of measuring…