visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-10-18 13:30 
연사  
장소 1st fl. #1323(E6-2) 

"Visualization of oxygen vacancy in motion and the interplay with electronic conduction"

 

Dr. Chan-Ho Yang, Department of Physics, KAIST
Oct. 18 (Tue.), 1:30 PM, 1st fl. #1323(E6-2)


Abstract:

The multiferroic BiFeO3 (BFO) is an interesting playground to explore correlated electronic conduction. Here, we substitute divalent Ca ions into the parent BFO and apply an external electric field at elevated temperatures to spatially redistribute spontaneously created oxygen vacancies, thereby generating hole carriers in regions of less dense oxygen vacancy concentrations. X-ray diffraction and photoemission spectroscopic measurement are employed to quantify a large variation of local oxygen vacancy concentration as much as ~1021 cm-3 and explore the consequent evolution of electronic band structure. We find that a non-rigid polaronic band is created by hole doping as a result of a strong electron-lattice coupling. We also show strong evidence for the disorder-driven formation of a Coulomb glass state through electronic transport measurement on a quantitative level. These spectroscopic and transport results can be combined and understood in the framework of intrinsic spatial inhomogeneity of polaronic charge density. Dynamical properties of oxygen vacancy in motion will be also discussed in a spatial-resolved way. The finding offers a promising platform and methodology for examining the interplay of functional defects and correlated electronic behaviors.

 

Contact: SunYoung Choi, (sunyoungchoi@kaist.ac.kr)
Center for Quantum Coherence in Condensed Matter, KAIST

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
426 2020-12-02 10:00    Recent progress in Axion Dark Matter eXperiment (ADMX) technology file
425 2020-11-17 12:00    Quantum- & Nano-Photonics" 세미나 시리즈 file
424 2023-05-15 16:00    Role of dark Higgs boson in DM physics and cosmology file
423 2019-10-15 16:00    Moiré superlattices and graphene quasicrystal file
422 2024-07-22 14:00    Nonthermal electronic orders in photo-doped Mott insulators
421 2017-08-16 16:00    Phonon-driven spin-Floquet valleytro-magnetism file
420 2025-02-03 14:00  Prof. Nobuyuki Yoshioka  Towards early fault-tolerant quantum computing file
419 2023-07-14 11:00    Interfaces engineering of thin film oxides
418 2024-07-25 16:00    Generation and Certification of Optical Quantum States for Information Processing file
417 2019-08-14 16:00    Quantum Optics, at the heart of quantum metrology and quantum information file
416 2019-10-17 16:00    Top down manipulation of Waves : From Metamaterials, Correlated Disorder, Quantum Analogy, to Digital Processing file
415 2018-12-27 16:00    Quantum Innovation (QuIN) Laboratory file
414 2025-03-07 11:00  Prof. Myunglae Jo  A tunable Mach-Zehnder interferometer in quantum hall graphene file
413 2023-09-27 16:00    Chiral Magnets: Domain-Wall Skyrmions and String Theory Realization
412 2019-06-04 17:00    Stochastic nature of bacterial eradication using antibiotics file
411 2015-06-03 12:00    The First Wednesday Multidisciplinary Forum file
410 2016-11-10 16:00    Low Dimensional Active Plasmonics and Electron Optics in Graphene
409 2023-07-20 16:00    [CAPP Seminar] Cosmoparticle Physics of Dark Universe file
408 2018-09-07 15:00    Recent developments in density functional theory: From new functionals to the nature of the chemical bond file
407 2021-04-09 10:00    Integrated Lithium Niobate Photonics file