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Physics Colloquium w/ faculty search candidate Dr. Dmitry Ovchinnikov

Van der Waals Topological Magnets

Date: Time: 4:30 pm–5:30 pm
Jorgensen Hall Room: 136
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.

Additional Public Info:
This colloquium will be in-person and available via Zoom if you cannot attend in person. There will be coffee and cookies available beforehand at 4:00 pm.

Zoom details:
Join Zoom Meeting

https://unl.zoom.us/j/96824842377pwd=dnJORnhpNTZwbkFuQ2k0eTJHS1FGUT09

Meeting ID: 968 2484 2377

Passcode: 171968

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