Seminar & Colloquium
[세미나: 10월 8일(화), 오후 4시] Prof. Adam Wei Tsen, University of Waterloo
Title
Tunneling Probe of 2D and Moiré Magnetism
Speaker
Prof. Adam Wei Tsen, Department of Chemistry and Institute for Quantum Computing, University of Waterloo
* Education
- 2006 - 2012 Ph.D. Cornell University (Advisor: Prof. Jiwoong Park)
- 2002 - 2006 B.S. Electrical Engineering and Computer Sciences with Honors, University of California, Berkeley
B.S., Engineering Physics with Honors
Minor, Mathematics
* Professional Experience
- 2023 - Present Assistant Professor, University of Waterloo
- 2016 - 2023 Associate Professor, University of Waterloo
- 2016 - 2023 Institute for Quantum Computing & Department of Chemistry
Department of Physics and Astronomy (cross-appointment)
Department of Electrical and Computer Engineering (cross-appointment)
Waterloo Institute for Nanotechnology (associate)
Perimeter Institute for Theoretical Physics (affiliate)
- 2013 - 2015 Postdoctoral Associate, Department of Physics, Columbia University
| Date | Tuesday, October 8th, 2024
| Time | 16:00 ~
| Venue | 33동 125호(WCU 다목적실)
[Abstract]
The discoveries of ferromagnetism in single atomic layers have opened a new avenue for two-dimensional (2D) materials research. Not only do they raise fundamental questions regarding the requirements for long-range magnetic order in low-dimensional systems, but they also provide a new platform for the development of spintronic devices. In this talk, I will present a series of studies on the layered ferromagnetic insulator, CrI3, both in the atomically thin limit and in twisted homostructures. By incorporating natural 2D CrI3 as tunnel barriers between graphene electrodes, we are able to achieve extremely large tunnel magnetoresistance and directly observe its spin wave, or magnon, excitation spectrum, from which we can then obtain a simple microscopic Hamiltonian for the monolayer spin system. For twisted CrI3, we observe evidence for two types of moiré magnetic textures that give rise to nonvolatile tunneling magnetoresistance states switchable by magnetic field.
| Host | 유효빈 교수(02-880-1550)