2007
DOI: 10.1126/science.1150124
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Mott Transition in VO 2 Revealed by Infrared Spectroscopy and Nano-Imaging

Abstract: 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 … Show more

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Cited by 1,360 publications
(1,163 citation statements)
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“…They show an abrupt, first-order transition in the absence of strain or doping 25 , in contrast to the percolation behaviour observed in thin-film samples 18 . The crystals vary in size (Fig.…”
Section: Resultscontrasting
confidence: 56%
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“…They show an abrupt, first-order transition in the absence of strain or doping 25 , in contrast to the percolation behaviour observed in thin-film samples 18 . The crystals vary in size (Fig.…”
Section: Resultscontrasting
confidence: 56%
“…However, the mechanism underlying both the thermal and photoinduced IMT remains unclear. While insulating VO 2 is clearly not a band insulator 16 , the importance of electron correlations and electron-phonon coupling for its properties remain unclear after more than half a century of study, and experimental results conflict with both Mott or Peierls explanations 7,[16][17][18][19] . For example, degenerate pump-probe studies 5 revealed a limiting transition timescale of 75 fs, suggesting a phonon bottleneck and therefore a structurally limited transition.…”
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confidence: 99%
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“…12 and Brar, V. et al, 2008 APS March Meeting, Abstract: U29.00003, unpublished) will inevitably lead to a broadening of the absorption onset at 2E F in σ 1 (ω), because infrared measurements register the absorption averaged over a large area (a few micrometres in our experiments). The origin of the inhomogeneity of E F in graphene is still an open question 12 , which needs to be explored using spatially resolved probes such as near-field infrared conductivity studies capable of probing the response of a material with nanometre resolution over a large area 13 .…”
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confidence: 99%
“…It provides for nano-imaging and -spectroscopy down to few nanometer length scales, gaining insight into molecular orientation [5] and coupling [6], catalytic activity [7], heterogeneity in electron and lattice dynamics [8,9], and plasmonic and polaritonic effects in quantum matter [10][11][12][13] with recent extension to the low temperature [9,14] and ultrafast regimes [15][16][17][18]. Despite these significant developments, s-SNOM has largely been limited to a narrow range of the electromagnetic spectrum of the near-to mid-IR at high frequencies, and the RF [19] and low THz [20] regime at low frequencies.…”
mentioning
confidence: 99%