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LASSP & AEP Seminar by Prof. David Goldhaber-Gordon (Stanford University)

Tuesday, April 9, 2024 at 12:20pm to 1:30pm

Clark Hall, 700
Central Campus

David Goldhaber-Gordon
Professor of Physics, Stanford University

Electrons in twisted layers: design, surprise, and a new set of eyes
When two atomically-thin layers of a material are stacked one atop each other, with a relative twist angle between them, properties can emerge that bear little resemblance to the behavior of the individual layers. Though much can be predicted and designed about such structures, I will share two vignettes about how my students aimed for a particular behavior but found something quite different. The first led to the discovery of the first experimentally-known "orbital magnet", a ferromagnet in which the tiny microscopic magnets that align with each other are not electron spins but tiny circulating current loops. The second surprise was observation of resistance that skyrocketed with the application of a magnetic field, along with other striking electronic properties -- this one took years to figure out, but we've recently explained it.

Each of these two surprises turned out to be caused by a structural feature of the layered stack which had not previously been considered important. Finally, I'll describe a refined approach to stacking and a newly-developed technique for mapping the structure of twisted layers, which together might help us get more repeatable control of structure and thus electronic properties in such twisted systems.

Hosted by Kenji Yasuda

Pizza served starting at 12:10 p.m.
Please bring your own beverage

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Event Type

Seminar

Departments

LASSP, Applied and Engineering Physics

Tags

engineering, lassp_and_aep_seminar, lassp, quantum_site, applied and engineering physics

Contact E-Mail

aao29@cornell.edu

Contact Name

Ann Owens

Contact Phone

607-255-5198

Speaker

Prof. David Goldhaber-Gordon

Speaker Affiliation

Stanford University

Open To

Public