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학술지 Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging
Cited 1276 time in scopus Download 8 time Share share facebook twitter linkedin kakaostory
저자
M.M.Qazilbash, M. Brehm, 채병규, P.C.Ho, G. O. Andreev, 김봉준, 윤선진, A. V. Balatsky, M. B. Maple, F. Keilmann, 김현탁, D. N. Basov
발행일
200712
출처
Science, v.318, pp.1750-1753
ISSN
0036-8075
출판사
American Association for the Advancement of Science (AAAS)
DOI
https://dx.doi.org/10.1126/science.1150124
초록
Electrons in correlated insulators are prevented from conducting by Coulomb repulsion between them. When an insulator-to-metal transition is induced in a correlated insulator by doping or heating, the resulting conducting state can be radically different from that characterized by free electrons in conventional metals. We report on the electronic properties of a prototypical correlated insulator vanadium dioxide in which the metallic state can be induced by increasing temperature. Scanning near-field infrared microscopy allows us to directly image nanoscale metallic puddles that appear at the onset of the insulator-to-metal transition. In combination with far-field infrared spectroscopy, the data reveal the Mott transition with divergent quasi-particle mass in the metallic puddles. The experimental approach used sets the stage for investigations of charge dynamics on the nanoscale in other inhomogeneous correlated electron systems.
KSP 제안 키워드
Correlated insulator, Coulomb repulsion, Electronic properties, Experimental Approach, Far-field, Free electrons, Increasing temperature, Infrared microscopy, Infrared spectroscopy(FT-IR in real time), Metallic state, Mott transition