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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.

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180 <5/12(월)> Nanoscale probing of electrochemical phenomena and ionic dynamics by scanning probe microscopy 2014.05.07 94117
179 <7/14> Calculating the partition function of N=2 Gauge theories on $S^3$ and AdS/CFT correspondence 2011.07.12 94142
178 <Sep. 29(Wed.)> Longitudinal Spin Seebeck effect in Pt/YIG structure with monolayer WSe2 and MoS2 interlayer 2021.09.16 94571
177 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 94849
176 <3/26> Shedding infrared light on high-Tc superconductors 2014.03.19 95195
175 <2/27> Carbon nanotubes as Electron Sources 2006.02.21 95294
174 2016학년도 2학기 콜로퀴움 일정 2016.08.02 95310
173 <12/19> The BLG Theory in Light-Cone Superspace 2009.12.15 95431
172 <12/3> Magnetic couplings, optical spectra, and spin-orbit exciton in 5d Mott insulator Sr2IrO4 2012.11.26 95439
171 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 95481
170 <2/14> Complex network models for mobile ad hoc networks 2011.02.11 95712
169 <Dec. 2(Wed.) 4:30 PM> Next-generation solar cells for high photo-conversion efficiency 2015.11.25 95886
168 <1/8>Supersymmetric states in AdS/CFT 2009.01.05 96054
167 <7/17> Atomic-scale polar oxide heterostructures: Growth and interfacial properties 2009.07.13 96213
166 <7/15> Experiment for Discoveries of Extrasolar Planets 2009.07.13 96551
165 <5/11> Hybrid Josephson Junctions of Various Nanostructures 2011.05.04 96626
164 <11/28> Extremal Black Holes and Holographic C-theorem 2012.11.28 96640
163 <5/18> Three magics to hold an atom without perturbation 2011.05.09 96878