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Department of Physics & Astronomy Colloquium

Quantum Sensing and Quantum Materials Discovery with the Scanning Tunneling Microscope

Date: Time: 4:00 pm–5:00 pm
Jorgensen Hall Room: 136
Contact: Physics Department, (402) 472-2770,
Dr. Fabian Natterer will present his topic, “Quantum Sensing and Quantum Materials Discovery with the Scanning Tunneling Microscope’ in-person. Coffee and cookies available beforehand at 3:30pm. Zoom will be set-up for people who cannot attend in person.

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Meeting ID: 956 9915 7714
Passcode: 712046

ABSTRACT: The semiconductor roadmaps highlight the quick introduction of 1 nm transistors, exemplifying the ever-advanced miniaturization of active devices down to the ultimate length scales of molecules and atoms. Nuances in the immediate atomic vicinity become decisive factors for their functioning and strongly influence electronic and magnetic properties. Further progress will hinge on whether proper tools for the prototyping, discovery and characterization of quantum matter are available. Although the scanning tunneling microscope (STM) offers atomic insight, its energy resolution can be inadequate to detect weak interactions. The introduction of STM based electron spin resonance opened a perspective of how to combine the excellent energy resolution of ESR with the atomic control of STM. We highlight these developments, mention their limitations, and discuss further work to generalize STM-ESR towards a universal quantum sensor. To cover the aspect of quantum materials discovery, we introduce an accelerated mapping method that we apply to the band-structure determination of quantum materials. Our combination of compressive sensing and parallel spectroscopy enables 1000-fold faster measurements to rapidly provide dependable data against which theoretical studies can be calibrated and create a massive dataset that can be used as input for big data approaches. Together, these methods allow for deeper insight into exotic quantum materials’ magnetic and electronic properties, ranging from single molecule magnets, topological materials, field-effect devices, radicals, noncolinear magnetism, superconductors, to strongly correlated electron systems.

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