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Tunneling Probe of 2D and Moiré Magnetism
					
 Feb 14, 2025 
 2:30PM to 3:30PM

									

				

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							BIMR Seminar Adam Wei Tsen - All details are in the event page as text							

															

						

						

	

		
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	Date/Time

	Date(s) - 14/02/2025
2:30 pm - 3:30 pm





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Prof. Adam Wei Tsen


Associate professor, Institute for Quantum Computing & Department of Chemistry, University of Waterloo


 


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. 


 


Biography


Dr. Wei Tsen’s research focuses on the study of low-dimensional materials that exhibit exotic quantum phenomena, and their integration into novel electronic devices. After receiving a BS in Electrical Engineering and Computer Sciences, as well as a BS in Engineering Physics at the University of California, Berkeley, he completed his PhD in Applied Physics at Cornell University under the guidance of Jiwoong Park. Tsen then joined the Department of Physics at Columbia University as a postdoctoral associate with Abhay Pasupathy and Philip Kim, where he studied atomically thin quantum materials and incorporated them in nanoscale electronic devices.


In 2016, he joined the University of Waterloo’s Department of Chemistry and the Institute for Quantum Computing. He is continuing to explore these materials and develop novel quantum devices based on their exotic properties.












In-Person: ABB 102


Online: https://mcmaster.zoom.us/j/91774139964


Meeting ID: 917 7413 9964

Passcode: 554831