상세정보
학술지
Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging
- 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)
- 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