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SUMMARY:Coexistence of Ion Diffusion and Superconductivity in Hydrides - H
 aoran Chen\, Peking University
DTSTART:20240429T133000Z
DTEND:20240429T140000Z
UID:TALK216238@talks.cam.ac.uk
CONTACT:Kang Wang
DESCRIPTION:In the past two decades\, hydrides under high pressures have e
 merged as a large family of superconductors. The light mass of hydrogen io
 ns leads to high vibrational frequencies and thus greatly assist the super
 conductivity in these systems. However\, the light mass also leads to stro
 ng anharmonic effects and quantum fluctuations\, making conventional harmo
 nic theories inadequate.\n \nIn this talk\, I will describe the recently d
 eveloped stochastic path-integral approach (SPIA) to study ion-mediated su
 perconductivity in general systems [1-3]. The approach is based on the ab 
 initio path integral molecular dynamics (PIMD) technique\, and directly de
 termines the effective attractive interaction between electrons by analyzi
 ng the fluctuations of electron-ion-scattering matrices. As a result\, the
  approach makes no assumption of the nature of ion motion\, and allows stu
 dies beyond harmonic solids\, even in systems with ion diffusion. Such dif
 fusion behavior does not only show up in liquids\, but also appear in “s
 olid” hydrides. We study two such systems: Li2MgH16 and defective LaH10 
 [4-5]. Calculations based on SPIA show ion diffusion could coexist with su
 perconductivity in both systems\, and could play important roles in modify
 ing superconducting properties.\n\nReferences:\n[1] Huiying Liu\, Ying Yua
 n\, Donghao Liu\, Xin-Zheng Li\, and Junren Shi\, Phys. Rev. Research 2\, 
 013340 (2020)\n[2] Haoran Chen\, Xiao-Wei Zhang\, Xin-Zheng Li\, and Junre
 n Shi\, Phys. Rev. B 104\, 184516 (2021)\n[3] Haoran Chen and Junren Shi\,
  Phys. Rev. B 106\,184501 (2022)\n[4] Haoran Chen and Junren Shi\, Phys. R
 ev. B 109\, L140505 (2024)
LOCATION:Zoom link: https://zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHpt
 UXlRSkppQT09
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