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Tuesday, November 1, 2022 at 12:20pm
Clark Hall, 700 Central Campus, 142 Sciences Drive
Assistant Professor of Physics
Thermodynamic sensing of correlated phases in twisted transition metal dichalcogenides
The twist angle between adjacent two-dimensional layers provides a powerful tuning knob to tailor electronic properties. When two materials have similar lattice constants and low interlayer twist, a moiré superlattice develops and can lead to flat electronic bands which host a variety of interaction-driven phases. In this talk, I will describe electronic compressibility measurements with a scanning single-electron transistor that reveal novel ground states and excitations in twisted semiconducting transition metal dichalcogenides. In twisted double bilayer WSe2, probing the energy gaps of the correlated insulating states as a function of magnetic and electric field allows us to determine their spin and valley character as well as identify itinerant spin polaron excitations. I will also present recent measurements of a device with a long moiré wavelength which reveal an intricate phase diagram of correlated states as a function of carrier density and magnetic field. I will discuss how these findings reflect the interplay between electronic interactions and the nature of the underlying moiré bands.
Pizza served starting at 12:10 p.m.
Please bring your own beverage
For those who cannot attend in person but would like to see the seminar, livestream only will be available via Zoom:
Webinar ID: 987 2279 9978