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)
583 2016-04-05 16:00    A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
582 2024-06-13 16:00    [CAPP seminars]Simulation, design and fabrication of Josephson Parametric Amplifiers for axion search file
581 2016-01-11 16:00    Mott Physics in the Strong Spin-Orbit Coupling Regime
580 2016-11-11 16:00    Dirac fermions in condensed matters
579 2019-06-28 14:00    1st Research-exchange meeting of computational material physics file
578 2025-06-05 11:00  Dr. Bruno Tomasello (University of Catania, Italy)  Crystal-Field Anisotropy and Low-Temperature Spin Seebeck in Terbium Iron Garnet file
577 2016-05-11 16:00    The quest for novel high-temperature superconductors---Prospects and progress in iridates
576 2018-02-12 15:00    The recent result of XMASS Experiment
575 2022-09-30 16:00    Spin-orbit torque-based spintronic devices file
574 2019-01-07 15:00    Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
573 2025-04-22 13:30  Dr. Chaebin Kim (Georgia Institute of Technology)  Emulation of quantum correlations by classical dynamics in quantum magnets file
572 2024-01-25 16:00    [CAPP seminars] Detecting Gravitational Waves by Elecromagnetic Cavity
» 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
570 2016-04-28 15:00    Lattice/Spin/Charge Coupling in 5d Pyrochlore Cd2Os2O7
569 2019-12-13 13:00    Computational Material Designs: Current Status and Future Directions file
568 2023-11-09 16:00    Assessing the Capability of Near-Term Photonic Devices Towards Quantum Supremacy
567 2018-09-04 14:30    Ultrafast time- and angle-resolved photoemission spectroscopy (tr-ARPES) with extreme ultraviolet laser pulses file
566 2016-04-08 16:00    Spectroscopic studies of iron-based superconductors : what have we learned?
565 2023-07-26 10:00    [CAPP Seminar] Am Expansive Search for Dark Matter with ADMX and DM Radio
564 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”