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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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503 <4/19> Nuclear Reaction Theories 2011.04.14 99349
502 <5/18> Three magics to hold an atom without perturbation 2011.05.09 99332
501 <11/19> From Schrödinger's cat to quantum technology using light 2010.11.11 99216
500 <12/19> The BLG Theory in Light-Cone Superspace 2009.12.15 99201
499 <11/11> Revealing magnetism of nanoislands with quantitative insights into spin-polarized scanning tunneling spectroscopy 2013.11.05 98624
498 영어초록 예시 2008.03.18 98318
497 <9/1> 원자핵 자기공명(Nuclear Magnetic Resonance) 해설 - 원자선에서 영상까지 2010.08.30 98294
496 <5/12(월)> Nanoscale probing of electrochemical phenomena and ionic dynamics by scanning probe microscopy 2014.05.07 98285
495 <11/14> Resonance collective mode in novel superconductors 2008.11.11 98284
494 <6/18> A consistent truncation of D=11 supergravity to D=4, N=2 supergravity using wrapped M5-branes 2010.06.10 98228
493 <7/14> Calculating the partition function of N=2 Gauge theories on $S^3$ and AdS/CFT correspondence 2011.07.12 98171
492 <6/19> 초전도 특별세미나 2012.06.11 98156
491 <2/8(Fri) 11:0 am ~ >Intertwined states in the pure and Nd-doped heavy fermion superconductor CeCoIn5 2019.02.08 97751
490 <10/8 (월)>물리학과 특별세미나 개최 안내 2012.10.05 97691
489 <10/9> Smearing effect of membrane in plane-wave matrix model 2009.10.05 97626
488 <11/27> 중성자로 보는 작은 세상 속 큰 물리 2009.11.24 97516
487 <10/16> SPM Study of CVD Graphene on h-BN Film 2013.10.04 97483