logo

korean english

게시판

Home > 게시판 > 세미나

아래와 같이 콜로퀴움을 개최하오니 많이 참석해 주시기 바랍니다.

4시 10분부터 제1과학관 31214 e+강의실 앞에서 다과를 준비하오니 많은 참석 부탁드립니다

 

아 래

 

제목: Understanding the Nature of Metal-Insulator Transition in a Single Crystalline VO2 nanowires

연사: 강   대   준 교수 (성균관대학교 물리학과)

일시: 2011년 3월 9(수) 오후4:30 장소: e+첨단강의실 (31214호실)

 

초록: Vanadium dioxide is a prominent example for a material exhibiting a
metal-insulator transition as a function of temperature: it undergoes
a first-order structural transition from a high-temperature metallic
phase to a low-temperature insulating phase at almost room-temperature
(T=340 K). The resistivity jumps by several orders of magnitude
through this transition, and the crystal structure changes from rutile
at high-temperature to monoclinic (so-called M1-phase) at
low-temperature. The latter is characterized by a dimerization of the
vanadium atoms into pairs, as well as a tilting of these pairs with
respect to the c-axis. Understanding the thermodynamics and structural
transformation during the Metal-Insulator Transition (MIT) is crucial
to  the underlying physical origin of phase transition in the vanadium
dioxide (VO2). Here, through the temperature-dependent in-situ high
resolution-transmission electron microscopy (HR-TEM), synchrotron XRD
and systematic electrical transport study, we have shown that the MIT
transition of VO2 nanowires is strongly affected by interplay between
strain and domain nucleation. Surprsingly, we have also observed that
the VO2 metallic phase could occur in a strain-induced metastable
monoclinic (M2) phase. These insights open the door toward more
systematic approaches to synthesis of VO2 nanostructures in desired
phase and to use for applications including ultrafast optical
switching, smart window, metamaterial, resistance RAM and synapse. I
will attempt to give you an overview of our research activity over
last 5 years on VO2 nanostructures and discuss fascinating features
and ample physics to explore.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1033004
326 <3/26> Fractional Hall Physics of Epitaxial Graphene: 2010.03.19 105267
325 2014학년도 2학기 콜로퀴움 일정 2014.09.11 104855
324 <6/8> 액체금속 및 물의 과냉각 현상과 국소구조와의 관계 : 정전기 공중부양 기술 및 dynamic diamond anvil cell 2011.06.07 103471
323 <5/27(수) 오후4:30분>Controlling phases in epitaxial transition metal oxide thin films 2015.05.21 103019
322 <4/27> RENO Reactor Neutrino Experiment 2011.04.18 102865
321 <10/15> Electric control of magnetic nanostructures via spin torque 2010.10.08 102755
320 <4/13> Introduction to Quantum Information Processing 2007.04.11 102423
319 <5/28> The hunt for high energy neutrinos with IceCube - more evidence for their astrophysical origin 2014.05.22 102123
318 <11/9> Bosons in high Tc superconductors: an experimental survey 2011.10.31 102053
317 <Oct.16(Wed.)> 솟구치는 초고에너지 입자의 미스테리 2019.10.10 101359
316 <9/11> Complex networks in technology, biology and sociology 2009.09.04 101297
315 <11/16> Study of carrier transport and charging effects in organic devices 2011.11.10 100903
314 <11/13> Computer-Aided Engineering for Nucleic Acid Nanostructures 2013.11.07 100109
313 <6/2>백색 LED를 이용한 반도체조명에 관하여 2006.05.29 99658
312 <4/16> Lasers, Microscopes, and Superconductors: Laser Scanning Microscopy of Superconducting Circuits 2014.04.10 99161
311 <6/1> Electron phonon coupling effect in 4d transition metal oxide magnetism 2011.05.26 99084
310 2014학년도 1학기 콜로퀴움 일정 2014.03.03 98064
309 <Nov. 8(Wed.) 4:30 PM> 연성물질 기반 위상학적 결함구조의 상전이와 응 2017.11.01 97978
308 <May 17(Wed.) 4:30 PM>Printed Electronics 2017.05.10 96941
307 <Oct.10(Wed.) 4:30 PM> Standard Model of Cosmology and Beyond 2018.09.21 96792