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TT: Fachverband Tiefe Temperaturen

TT 92: Transport – Poster

TT 92.19: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Ultra-Low Temperature Fast QPI on Quantum Materials — •Alexander LaFleur, Rian A.M. Lighthart, Kevin Hauser, Gleb Neplyak, and Fabian D. Natterer — Department of Physics, Univeristy of Zurich, Winterthurerstrasse 190, CH-8057, Switzerland

Scanning tunneling microscopy/spectroscopy (STM/S) is a powerful experimental technique capable of elucidating the hidden nature of many quantum materials and phases. The characterization of unconventional superconductors, topological insulators, heavy-fermion systems, Kagome superconductors, and Weyl semimetals, have been broadly pushed forward by atomic resolution STM/S imaging. Yet, for many candidate quantum materials, current techniques for acquiring STM data, such as energy-dependent local density of state (LDOS) maps, fall short of the energy resolution necessary to show definitive band structure characteristics of these phases. We propose to combine ultra-low temperature STM (330 mK) with Fast Quasi-Particle Interference (Fast QPI) techniques to increase the effective hold time and energy resolutions of LDOS Maps taken on quantum materials. The Fourier transform of Fast QPI, which uses parallel spectroscopy to simultaneously measure LDOS across many channels in frequency space, allows the energy dependent LDOS to be measured in a fraction of the time of conventional dI/dV lock-in techniques. This increase in energy resolution given the time constraints of ultra-low temperature measurements holds the potential to demonstrate new and novel observable phenomena in quantum materials and the elusive states they harbor.

Keywords: quantum materials; scanning tunneling microscopy/spectroscopy; unconventional superconductors; topological insulators; heavy-fermion systems