visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2023-05-26 11:00 
일시 May. 26 (Fri) 11:00AM 
장소 E6-2 #1323 
연사 이형우 (아주대학교 물리학과 교수) 
* 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 장소 제목
531 2009-02-23 16:00  E6, 1501  Physics Colloquium : 2009 Spring file
530 2009-09-07 16:00  E6, 1501  Physics Colloquium : 2009 Fall file
529 2009-10-21 16:00  E6, 1501  Interdimensional Universality of Dynamic Interfaces
528 2010-02-08 16:00  E6, 1501  Physics Ciolloquium : 2010 Spring file
527 2010-02-14 16:00  E6, 1501  Physics Colloquium - 2011 Spring file
526 2010-09-06 16:00  E6, 1501  Physics Colloquium : 2010 Fall file
525 2011-05-16 16:00  E6, 1501  Photonics with surface plasmon polaritons
524 2011-09-03 16:00  E6, 1501  Physics Colloquium : 2011 Fall file
523 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring
522 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
521 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
520 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
519 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
518 2014-05-28 17:00  KI Building, Matrix Hall  부품소재산업이 미래다
517 2014-12-22 14:00  E6, Rm1319  Dynamics of molecular motors: Power stroke vs Brownian ratchet file
516 2015-03-04 12:00  1323호, E6-2  Bioimaging and Biosensing Using Near-Infrared Fluorescence file
515 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
514 2015-03-13 14:00  Connect Room, KI Bldg.  The 15th Innovative Workshop on Soft/Bio Materials file
513 2015-06-03 12:00  Room 101, E11  The First Wednesday Multidisciplinary Forum file
512 2015-07-15 14:00  E6-2,1323  Electronic and optical properties of titanate-based oxide superlattices