Events

Wisconsin Quantum Institute

<< Fall 2021 Spring 2022 Summer 2022 >>
Subscribe your calendar or receive email announcements of events

Events During the Week of February 20th through February 27th, 2022

Monday, February 21st, 2022

No events scheduled

Tuesday, February 22nd, 2022

Embarking on a Thermal Journey in Low Dimensions with a 21st century thermometer: Graphene Nonlocal Noise
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Jonah Waissman, Harvard University
Abstract: Low-dimensional materials, such as 2D monolayers, 1D nanowires, and 0D quantum dots and molecules, are rich with many-body quantum phenomena. The reduced dimensionality, strong interactions, and topological effects lead to new emergent degrees of freedom of fundamental interest and promise for future applications, such as energy-efficient computation and quantum information. Thermal transport, which is sensitive to all energy-carrying degrees of freedom and their interactions, provides a discriminating probe to identify these emergent excitations. However, thermal measurement in low dimensions is dominated by lattice contributions, requiring an approach to isolate the electronic thermal conductance. In this talk, I will discuss how the measurement of nonlocal voltage fluctuations in a multiterminal device can reveal the electronic heat transported across a mesoscopic, low-dimensional bridge. We use 2D graphene as an electronic noise thermometer, demonstrating quantitative electronic thermal conductance measurement over a wide temperature range in an array of dimensionalities: 2D graphene, 1D nanotubes, 0D localized electron chains, and 3D, microscale bulk materials. I will discuss ongoing work revealing electron hydrodynamics, interaction-mediated plasmon hopping, spin waves in a magnetic insulator, and an electron-phonon crossover in a bulk spin liquid candidate material.
Host: Robert McDermott
Add this event to your calendar

Wednesday, February 23rd, 2022

No events scheduled

Thursday, February 24th, 2022

Spintronics with 2D and Topological Materials: Outstanding Opportunities in van der Waals Heterostructures
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Yunqiu Kelly Luo, Cornell University
Abstract: Advances in quantum science and technology rely on ever-improving control over quantum degrees of freedom including electron spin, photons, and magnons, which can store, transmit, and exchange information. Understanding their mutual interactions, propagation, and non-equilibrium dynamics within solid-state systems is a crucial challenge at the forefront of this effort. My research broadly investigates the dynamics and effective couplings among these quantum degrees of freedom. Specifically, my talk will center around two themes: 1. developing multifunctional vdW heterostructures for spin-based quantum information processing; 2. accelerating next-generation spin-orbit torque MRAM based on 2D magnets and topological materials. Led by the development of optical-valleytronic spin injection, ultrafast optical scanning microscopy, and Sagnac interferometry, I will present our experimental efforts in harnessing the outstanding opportunities enabled by the pristine van der Waals interfaces of 2D materials with unparalleled Kerr sensitivity, temporal, and spatial resolutions. Our work aims to bridge the urgent needs of the microelectronics industry by enabling new forms of nonvolatile magnetic memory, low-power computing, optical interconnects, and multifunctional hybrid materials with widespread societal impact.
Host: Robert McDermott
Add this event to your calendar

Friday, February 25th, 2022

No events scheduled