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)
435 2018-10-04 16:00    Engineering light absorption in an ultrathin semiconductor metafilm file
434 2018-10-11 16:00    Dirac electrons in a graphene quasicrystal file
433 2018-10-12 14:30    Quantum Advantage in Learning Parity with Noise file
432 2018-10-12 16:00    Direct observation of a two-dimensional hole gas at oxide interfaces file
431 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
430 2018-10-16 10:00    Capturing protein cluster dynamics and gene expression output in live cells file
429 2018-10-18 10:00    Understanding membrane protein folding using single-molecule force techniques file
428 2018-10-18 16:00    Applications of nonlinear optics for condensed matter researches file
427 2018-10-19 10:00    Energy conversion processes during magnetic reconnection in a laboratory plasma file
426 2018-10-24 10:30    Photonic integration of next-generation clocks and Hertz-absolute-accuarcy optical frequenncy synthesizers file
425 2018-10-25 16:00    Abelian and non-Abelian dark photons file
424 2018-10-26 16:00    Coexisting triple-point and nodal-line topological magnons and thermal Hall effect in pyrochlore iridates file
423 2018-11-01 16:00    Direct holography from a single snapshot file
422 2018-11-08 16:00    Conformality lost file
421 2018-11-09 14:30    Moiré superlattices – from twisted bilayer graphene to quasicrystal file
420 2018-11-09 16:00    Quantum sensing and imaging with diamond defect centers for nano-scale spin physics file
419 2018-11-21 15:00    Engineering topological quantum physics at the atomic scale file
418 2018-11-22 15:00    Experimental and Computational Study on Physical Properties based on Granular System file
417 2018-11-23 15:00    Entanglement string and Spin Liquid with Holographic duality file
416 2018-11-29 16:00    양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file