visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-06-08 16:00 
일시 June 8, 16:00 
장소 E6-2, #1323 
연사 Prof. Gun-Do Lee( Seoul National University) 
서울대학교 이건도 연구교수님을 모시고 'Thermal decoupling in high-Tc cuprate superconductors' 주제에 대한 세미나를 개최하고자 합니다. 
물리학과 구성원 여러분들의 많은 참여 부탁드립니다.
 
1) Time : at 16:00 on June 8, 2023 
2) Venue : Room 1323, KAIST Natural Sciences Lecture Hall(E6) (자연과학동 1323호)  
3) Speaker : 이건도 연구교수 (서울대학교) 
4) Talk Title
    - Thermal decoupling in high-Tc cuprate superconductors
 
5) Abstract
    -  Although many years have passed since the discovery of high-critical-temperature (high-Tc) superconducting materials, the underlying mechanism is still unknown. The B1g phonon anomaly in high-Tc cuprate superconductors has long been studied; however, the correlation between the B1g phonon anomaly and superconductivity has yet to be clarified. In the present study, we successfully reproduced the B1g phonon anomaly in YBa2Cu3O7 (YBCO) using an ab initio molecular dynamics (AIMD) simulation and temperature-dependent effective potential (TDEP) method. The Ag phonon by Ba atoms shows a more severe anomaly than the B1g phonon at low temperatures. Our analysis of the phonon anomaly and the temperature-dependent phonon dispersion indicated that decoupling between thermal phenomena and electron transport at low temperatures leads to layer-by-layer thermal decoupling in YBCO. Electronically and thermally isolated Ba atoms in YBCO are responsible for thermal decoupling which is found to be the origin of the breakdown of the Wiedemann-Franz law and the thermal Hall effect in cuprates. The analytic study of the thermal decoupling revealed that Planckian dissipation expressing linear-T resistivity is another expression of the Fermi liquid of the CuO2 plane. The Uemura plot of the relationship between Tc and the Fermi temperature, as well as the superconducting dome in YBCO, is explained rigorously and quantitatively. Our findings not only present a new paradigm for understanding high-Tc superconductivity but also imply that the spontaneous formation of low-temperature layers in materials can lead to revolutionary changes in the thermal issues of industrial fields.

 

[1] S. LeeW. ChoiY. KimY.-K. KwonD. SongM. KimG.-D. Lee Thermal decoupling in high-Tc cuprate superconductors, Preprint at https://arxiv.org/abs/2303.11600 (2023).

 
번호 날짜 장소 제목
343 2023-11-22 16:00  E6-2, #2502  [High Energy Theory Seminar] Renormalization and the Hierarchy Problem
342 2023-10-04 16:00  E6-2, #2502  [High-Energy Theory Seminar] Moving towards quantum technologies: the case of quantum batteries
341 2023-05-03 16:00  E6-2, #2502  Probing microscopic origins of axions by the chiral magnetic effect
340 2024-03-27 16:00  E6-2, #2502  [High Energy Theory Seminar] The Callan Rubakov Effect
339 2023-03-22 16:00  E6-2, #2502  (High Energy Theory Seminar) Boltzmann or Bogoliubov? A Case of Gravitational Particle Production
338 2023-09-26 16:00  E6-2, #2502  [High Energy Theory Seminar]A new step in interacting dark sector cosmologies
337 2024-01-16 16:00  E6-2, #2502  [High Energy Theory Seminar] Towards quantum black hole microstates
336 2023-06-14 16:00  E6-2, #2502  [High-Energy Theory Seminar]Vertex algebras and extended operators in 4d N=2 SCFTs
335 2023-06-16 13:00  E6-2, #2502  Quantum critical states under extreme conditions
334 2023-11-01 16:00  E6-2, #2502  [High Energy Theory Seminar] Modular functions and 3D N=4 rank-zero superconformal field theories
333 2023-08-29 16:00  E6-2, #2502  [High Energy Theory Seminar] Towards string loop corrections in Calabi-Yau orientifold compactifications.
332 2024-05-28 10:00  E6-2, #2501  Mixed-State Quantum Spin Liquids and Dynamical Anyon Condensations in Kitaev Lindbladians
331 2024-05-28 11:00  E6-2, #2501  동적평균장 이론 소개
330 2024-05-30 10:00  E6-2, #2501  Quasiperiodic Effects in Quasicrystals
329 2015-08-03 10:30  E6-2, #1323 (Seminar Room)  Axion Search
328 2024-05-16 16:00  E6-2, #1323  [High Energy Theory Seminar] Conformal Collider Physics
327 2022-09-15 13:00  E6-2, #1323  AdS black holes: a review
326 2024-06-13 16:00  E6-2, #1323  Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
325 2024-01-03 11:00  E6-2, #1323  Interplay of Strong Correlations, Topology, and Disorder in 2D Quantum Matters
324 2024-01-16 14:00  E6-2, #1323  Dimer Physics and Superconductivity in La3Ni2O7