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Speaker: Dr. Li Shi
Affiliation: University of Texas at Austin

Abstract: High-thermal conductivity semiconductors can enable revolutionary device technologies to address the grand challenge in thermal management of nanoelectronics and optoelectronics. Meanwhile, the ability of a magnetic insulator (MI) to transport a pure spin current offers new approaches to information processing and energy conversion beyond conventional semiconductor and metallic spintronic devices that rely on highly dissipative charge currents. Here I will report a finding of unusual high thermal conductivity in a semiconductor from sensitive electro-thermal and lock-in Raman scattering measurements. In addition, I will introduce lock-in Brillouin light scattering and magnetoresistance measurements of spin generation, injection, and transport in a metal/MI heterostructure. The measurement results are analyzed to find a large spin population and appreciable spin-mediated heat flux injected by the spin Hall effect from a normal metal into a MI, quantify the spin diffusion length, and discover a spin Peltier magnetoresistance. I will discuss the potential impact of these studies of phonon and spin transport on emerging semiconductor technologies and MI-based spintronics, as well as on the heat transfer discipline.

Biosketch: Li Shi is the BF Goodrich Endowed Professor in Materials Engineering at The University of Texas at Austin. He was an IBM Research Staff Member for a year after receiving a PhD degree from University of California at Berkeley in 2011. Dr. Shi currently serves as the Editor-in-Chief of Nanoscale and Microscale Thermophysical Engineering. He is a recipient of the CAREER Award from National Science Foundation, the Young Investigator Award from Office of Naval Research, the O’Donnell Award in Engineering from Academy of Medicine, Engineering, and Science of Texas, and the 2018 Heat Transfer Memorial Award in Science from American Society of Mechanical Engineers (ASME). He is an elected fellow of ASME and American Physical Society (APS).
Li Shi is the BF Goodrich Endowed Professor in Materials Engineering at The University of Texas at Austin. He was an IBM Research Staff Member for a year after receiving a PhD degree from University of California at Berkeley in 2011. Dr. Shi currently serves as the Editor-in-Chief of Nanoscale and Microscale Thermophysical Engineering. He is a recipient of the CAREER Award from National Science Foundation, the Young Investigator Award from Office of Naval Research, the O’Donnell Award in Engineering from Academy of Medicine, Engineering, and Science of Texas, and the 2018 Heat Transfer Memorial Award in Science from American Society of Mechanical Engineers (ASME). He is an elected fellow of ASME and American Physical Society (APS).

Date/Time:
Date(s) - Jun 19, 2018
2:00 pm - 3:00 pm

Location:
Engr. VI, Conference Room 289
404 Westwood Plaza, Los Angeles CA 90095