Speaker
Berk Zengin
Description
Recent advances in signal processing enable the fundamentally faster measurement of the current-voltage characteristic for tunneling spectroscopy through the parallel demodulation of higher harmonics that are produced from nonlinearities in the tunneling junction. The local density of states (LDOS) can thus be measured in a few milliseconds. Here, we use the fast spectroscopy for quasiparticle interference imaging not only at a fixed tunneling impedance but also measure the LDOS for varying tip-sample separations. From the tip-height dependent I-V measurements, we obtain voltage dependent decay length measurements in an energy interval previously inaccessible.
Authors
Berk Zengin
Fabian Natterer
(University of Zurich)
Co-authors
Danyang Liu
Kevin Hauser
(University of Zurich)
