visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-05-26 11:00 
연사  
장소 E6-2 #1323 
* Title: Spectral Analyses of Stochastic Charge Trapping in Oxide Heterostructures
 
* Speaker: 이형우 (아주대학교 물리학과 교수)
 
* Date: 2023. 5. 26.(금) 11:00
 
* Place: E6-2 #1323
 
* Abstract
Exploiting oxygen vacancies has emerged as a versatile tool to tune the electronic and optoelectronic properties of complex oxide heterostructures. For the precise manipulation of the oxygen vacancy point defects, the capability of directly probing the defect distribution in nanoscale is essential, but still lacking. In this talk, first, the charge trapping behavior of oxygen vacancies in oxide heterostructures will be introduced. The stochastic charge trapping of the oxygen vacancies results in the characteristic carrier number fluctuation. We employ a classical spectral analysis method to interpret the carrier number fluctuation phenomena. Second, it will be shown that the spectral analysis method can probe the ionization state distribution of oxygen vacancies in oxide heterostructures. Based on the capability and limitation of the classical spectral analyses, lastly, we suggest a novel approach of the machine leaning-assisted spectral analysis method. The specifically-designed machine learning model allow us to evaluate the spatial distribution of the ionized oxygen vacancies from current noise signals. The correlation between the ionization state distribution of the oxygen vacancies and the stochastic charge trapping behavior will be discussed. Our works introduce a powerful strategy to quantitatively probe the spatial distribution of point defects in oxide heterostructures with nm-scale precision.
 
Attached: C.V
Inquiry: Prof. Se Kwon Kim(sekwonkim@kaist.ac.kr) / Prof. Hee Jun Yang (h.yang@kaist.ac.kr)
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)
354 2022-04-01 16:00    High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
353 2022-03-31 16:00    (광학분야 특별세미나)Ultrafast time-resolved spectroscopy in topological materials
352 2022-03-31 10:00    Weiss fields for Quantum Spin Dynamics file
351 2022-03-29 10:00    Non-reciprocal phase transitions file
350 2022-03-28 16:00    Ultimate-density atomic semiconductor via flat bands
349 2022-03-25 11:00    (응집물리 세미나) Hund's metallicity in ruthenate systems file
348 2022-03-21 16:00    Multi-wavelength Studies on Relativistic Jets from Gamma-ray Bright Active Galactic Nuclei
347 2022-03-18 11:00    (응집물리 세미나) Illuminating exotic states of matter: Raman spectroscopy as an experimental tool to characterize quantum spin liquids file
346 2022-03-14 16:00    Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
345 2022-03-07 16:00    Climate Physics and Modelling(우리말강의)
344 2022-02-28 16:00    Spin-based training of optical microscopes
343 2022-01-26 13:00    An Introduction to Cohomology groups file
342 2022-01-25 15:00    Emulating twisted double bilayer graphene with a multiorbital optical lattice file
341 2022-01-18 14:00    Data-driven interrogation of biological dynamics: from subcellular interactions to neuronal networks in vivo file
340 2022-01-17 14:00    Five Lectures on Observational Probes of Dark Energy file
339 2022-01-12 11:00    Spectroscopic study of trapped ions towards probing dark matter and new physics file
338 2022-01-11 15:00    Ultrafast optical studies on CDW collective modes of the Weyl-CDW (TaSe4)2I file
337 2021-12-03 16:00    Nonequilibrium Heat Transport in Elemental Metals Probed by an Ultrathin Magnetic Thermometer file
336 2021-12-03 14:30    Topological Spin Textures: Skyrmions and Beyond file
335 2021-11-02 16:00    Metrology of Band Topology via Resonant Inelastic X-ray Scattering file