HAPPENING NOW- Tuesday Colloquium

Tue Feb 27 15:30:44 EST 2024

From: The Ohio State University Department of Physics <scopel.6 at osu.edu>
Sent: Tuesday, February 27, 2024 3:30 PM
To: Scopel, Carly <scopel.6 at osu.edu>
Subject: HAPPENING NOW- Tuesday Colloquium

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COLLEGE OF ARTS AND SCIENCES | DEPARTMENT OF PHYSICS

Happening NOW-Spring 2024 Colloquium Series

Please join us at 3:45 PM for Colloquium with Professor Jyoti Katoch from Carnegie Mellon University.

Probing Highly Tunable Electronic Properties of Layered Quantum Materials

Abstract: Extreme surface sensitivity of two-dimensional (2D) materials provides an unprecedented opportunity to engineer the physical properties of these materials via changes to their surroundings, including substrate, adsorbates, defects, etc.  In addition, 2D materials can be mechanically assembled layer-by-layer to form vertical or lateral heterostructures, making it possible to create novel material properties merely by the choice of the constituting 2D layers. For instance, van der Waals (vdW) heterostructures with a twist angle between the constituent layers, provide ability to create nanoscale perturbations that have shown to give rise to coexisting complex phases of matter including Mott insulating state, superconductivity, bound quasiparticles, and topological states. The advent of the state-of-the-art angle-resolved photoemission spectroscopy with nanoscale spatial resolution (nanoARPES) and the ability to perform these measurements on fully functional devices, has made it possible to directly probe many exotic physical phenomena in 2D based material systems. In this talk, I will present our work on directly visualizing (without any assumption) the electronic properties in vdW materials utilizing the cutting edge in-operando nanoARPES on 2D heterostructures and their fully functional devices. I will present the experiments which demonstrate on-demand tuning of the electronic band structure in atomically thin systems, such as transition metal dichalcogenides (TMDs) and graphene, by varying the twist-angle between the atomic layers and external dopants. Specifically, I will discuss the electric field tuning of the electronic interactions that result in van Hove singularity and flat bands in twisted bilayer graphene and twisted double bilayer graphene heterostructures. Also, I will show our recent results where we observe the formation of quasiparticle polarons due to many-body interactions in graphene/TMD heterostructures.

Faculty Host: Fengyuan Yang
Location: 1080 Physics Research Building

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Join Us for the Colloquium and Reception
Event details:

  *   Speaker: Professor Jyoti Katoch
  *   Reception starts at 3:30 PM, outside 1080 PRB
  *   Colloquium 3:45- 4:45 PM, 1080 Physics Research Building
Refreshments will be provided at 3:30 PM.

[Photo of exterior of Smith Seminar Room, Physics 1080. (Location of Colloquium and Reception.)]

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