Research Seminars @ Illinois

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Tailored for undergraduate researchers, this calendar is a curated list of research seminars at the University of Illinois. Explore the diverse world of research and expand your knowledge through engaging sessions designed to inspire and enlighten.

To have your events added or removed from this calendar, please contact OUR at ugresearch@illinois.edu

IQUIST Seminar: "Probing Topology and Correlation by Milli-Kelvin Microwave Microscopy", Keji Lai, University of Texas at Austin

Event Type

Seminar/Symposium

Sponsor

IQUIST

Location

190 Engineering Sciences Building, 1101 W Springfield Ave, Urbana, IL 61801

Date

Apr 1, 2025 11:00 - 11:50 am

Speaker

Keji Lai, Professor, University of Texas at Austin

Contact

Stephanie Gilmore

E-Mail

stephg1@illinois.edu

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Originating Calendar

IQUIST Seminar Series

"Probing Topology and Correlation by Milli-Kelvin Microwave Microscopy"

Abstract: Near-field microwave microscopy has been an actively evolving research field in the past few decades. For the study of quantum materials, the technique is usually configured in cryogenic environments such that the thermal energy is comparable to or smaller than the scales of intrinsic quantum mechanical energy in the system. In this work, we implement a dilution-refrigerator-based scanning microwave impedance microscope (MIM) with a base temperature of 100 mK. The vibration noise of our apparatus with tuning-fork feedback control and close-cycled helium recovery is as low as 1 nm. Using this setup, we have demonstrated the imaging of various quantum materials with flat energy bands. For gated monolayer graphene, the MIM can map out the evolution of edge and bulk states around multiple integer filling factors. For H-stack twisted transition-metal dichalcogenides, the MIM can reveal the presence of correlated states at integer fillings of the moire superlattice. Our study establishes an experimental platform for investigating nanoscale quantum phenomena at ultralow temperatures.

To watch online go to the IQUIST youtube channel: https://www.youtube.com/channel/UCCzAySwQXF8J4kRolUzg2ww

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