korean english


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 1091597
239 <9/18> 생체계에서의 협동현상: 박테리아 수영에서부터 고분자 수송현상까지 2009.09.14 95556
238 <9/11> Epitaxial Oxygen Sponge 2013.09.09 95579
237 <Mar.27(Wed.)> Ultrafast Movie Maker for Photo-induced Dynamics: Ultrafast Electron Microscope 2019.03.20 95883
236 <10/13> What has happened in the beginning of the universe? 2006.10.11 96007
235 <5/23> Nanotechnology in Korea: Present Status and Perspective 2008.05.21 96040
234 <11/20> Particle Accelerators: Driving Forces for Energy 2009.11.16 96275
233 <4/3> Spin-orbit coupling induced Mott insulating state 2009.03.13 96581
232 <4/17> Probing Stellar Explosions with Radioactive Beams* 2013.04.10 96617
231 <1/26> Hamiltonian formalism 2011.01.19 96704
230 <Sep. 30(Wed.) 4:30 PM>Local electronic structures of stacking grain boundary in bilayer graphene 2015.09.23 96802
229 <6/12> Latest Results from the IceCube Neutrino Observatory 2013.06.07 96861
228 <10/12> Kondo Effect in a Quantum-Dot-Topological-Superconductor Junction: A Numerical Renormalization Group Analysis 2012.10.08 96881
227 <5/14> Synthesis of Two Dimensional Materials by Chemical vapor deposition 2014.05.07 96892
226 <11/4>Plasmonic Properites of Metallic Nanostructures 2009.10.30 96965
225 <12/7>유럽입자물리연구소에서의 CMS 실험 2007.12.03 97069
224 2016학년도 2학기 콜로퀴움 일정 2016.08.02 97140
223 <Oct.20(Tue) 10:00-12:00> Novel quantum transport in Weyl semimetals and double-Weyl semimetals 2015.10.23 97163
222 <11/21> 복잡 산화물 이종접합 및 다강체 연구(Complex oxide heterostructures and multiferroics) 2012.11.15 97193
221 <11/27> Introduction to Terahertz and Infrared Spectroscopy 2013.11.21 97214
220 <4/22> How Many is Different? Ideal Bose gas revisited 2011.04.22 97224