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Department of Physics & Astronomy Colloquium

Van der Waals Topological Magnets

Date: Time: 4:30 pm–5:30 pm
Jorgensen Hall Room: 136
Contact: Physics Department, (402) 472-2770,
Dr. Dmitry Ovchinnikov will present his colloquium topic, “Van der Waals Topological Magnets” in-person and via Zoom. Coffee and cookies will be available at 4:00pm.

Join Zoom Meeting:
Meeting ID: 968 2484 2377
Passcode: 171968

ABSTRACT: The breaking of time-reversal symmetry in topological insulators leads to novel quantum states of matter. One prominent example at the two-dimensional limit is the Chern insulator, which hosts dissipationless chiral edge states at sample boundaries. These chiral edge modes are perfect one-dimensional conductors whose chirality is defined by the material magnetization and backscattering is topologically forbidden. Recently, van der Waals topological magnet MnBi2Te4 emerged as a new solid-state platform for studies of the interplay between magnetism and topology. In this talk, I will present an overview of our progress in control of topological phase transitions and chiral edge modes in MnBi2Te4. First, I will show how topological properties are intimately intertwined with magnetic states. I will then demonstrate electrical control of the number of chiral edge states. Finally, I will show the discovery of chiral edge modes along with the crystalline steps and how these modes can be harnessed for the engineering of simple topological circuits.

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