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SUMMARY:Theories of Cross phenomena and Zentropy - Zi-Kui Liu (Penn State)
DTSTART:20220519T130000Z
DTEND:20220519T140000Z
UID:TALK174203@talks.cam.ac.uk
CONTACT:Jan Behrends
DESCRIPTION:Cross phenomena\, representing responses of a system to extern
 al stimuli\, are ubiquitous from quantum to macro scales.  Through flux eq
 uations based on the combined law of thermodynamics\, theory of cross phen
 omena is developed and applied to thermoelectricity\, thermodiffusion\, di
 ffusion\, electromigration\, electrocaloric and electromechanical effects\
 , and thermal expansion.  It is shown that the coefficient matrix connecti
 ng the driving forces and the fluxes is intrinsically diagonal\, and thus 
 symmetrical in accordance with Onsager’s reciprocal relations (https://d
 oi.org/10.1080/21663831.2022.2054668).  In order to predict the emergent c
 ross phenomena\, the zentropy theory is developed to represent the total e
 ntropy of a system (macrostate) by a nested formula with two portions: the
  weighted average of the entropies of statistically significant configurat
 ions of the system (microstates) and the statistical distribution of the m
 icrostates in the system. It is shown that when the microstates are repres
 ented by mixed quantum states\, the free energy of each microstate should 
 be used in their partition functions instead of internal energy commonly u
 sed in the literature (https://doi.org/10.1007/s11669-022-00942-z).
LOCATION:Details of video conferencing will be distributed nearer the time
 .
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