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Online Colloquium: Resonance and fluctuation in small systems

ABSTRACT

We studied the fluctuation in small finite structures and found that its spatial distribution is not uniform, the magnitude of the fluctuation depends on external parameters such as the size and the shape of the structure and changes can occur by an order of magnitude.

We applied this idea to near field heat conductance of finite systems and found that the conductance can be expressed as sums of contributions from the resonances of the combined structure of the “receiver” and the “source”. Our work opens the door to investigate near-field heat transfer between finite systems and in particular metamaterials whose resonances have been well studied. We illustrate our results with an example of energy transfer between two split ring resonators separated by a distance d on top of each other. As d is decreased, when the cuts of the two rings are opposite each other, the heat conductance increases much faster with d than that when the cuts of the two rings are on top of each other. 


 

BIOGRAPHY

Prof. Siu-Tat Chui received his BS degree in Physics from McGill University in 1969 and his PhD degree in Physics from Princeton University in 1972. He was an Assistant Professor at the University at SUNY-Albany from 1975 to 1979 and joined the Bartol Research Foundation in 1979. He is currently a Professor in the Bartol Research Institute of the Department of Physics and Astronomy, University of Delaware. Prof. Chui’s main research interests are in theoretical condensed matter physics. His work includes droplets of quantum fluids, metamaterials, micromagnetics of small structures, spin-polarized transport, and physics of power electronics.

 

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Event Details
Speaker
Prof. Siu-Tat CHUI
Professor, Bartol Research Institute and Dept. of Physics and Astronomy, University of Delaware

Date & Time
18 February 2022 3:00 PM

Venue
Zoom Meeting, City University of Hong Kong

Chair
Dr Shubo Wang (34429143)
shubwang@cityu.edu.hk