Infrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide
By M. M. Qazilbash, M. Brehm, G. Andreev, A. Frenzel, P. Ho, B. Chae, B. Kim, S. Yun, Hyun-Tak Kim, Alexander V. Balatsky and 4 more. 2009
149 citations recorded by the source corpus.
We present a detailed infrared study of the insulator-to-metal transition IMT in vanadium dioxide VO2 thin films. Conventional infrared spectroscopy was employed to investigate the IMT in the far field. Scanning near-field infrared microscopy directly revealed the percolative IMT with increasing temperature. We confirmed that the phase transition is also percolative with cooling across the IMT. We present extensive near-field infrared images of phase coexistence in the IMT regime in VO2. We find that the coexisting insulating and metallic regions at a fixed temperature are static on the time scale of our measurements. A distinctive approach for analyzing the far-field and near-field infrared data within the Bruggeman effective medium theory was employed to extract the optical constants of the incipient metallic puddles at the onset of the IMT. We found divergent effective carrier mass in the metallic puddles that demonstrates the importance of electronic correlations to the IMT in VO2. We employ the extended dipole model for a quantitative analysis of the observed near-field infrared amplitude contrast and compare the results with those obtained with the basic dipole model.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/c66116c156d6f0658891de8fc2c352eb5a3882d6
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In Electrical and Electronic Engineering
In Electronic, Optical and Magnetic Materials
- R. Averitt
- D. Basov
- Sanjay Krishna
- D. Marel
- G. Chinna R. Devarapu
- Ganapathi Subramania
- Stavroula Foteinopoulou
- M. Dressel
Citations in the corpus
- Phonon-polaritonics: enabling powerful capabilities for infrared photonics (2019, methodology): “24 The real (imaginary) parts of the permittivity [green-dotted (bluedotted) lines of Figure 26B-III] has been calculated from [290] by taking the experimental properties as depicted in Figure 4 and using relations (1), (C1), and (C2) of this reference.”
- Electrodynamics of correlated electron materials (2011, background): “This latter result is in accord with the notion that proximity to antiferromagnetic order does not appreciably reduce electronic kinetic energy of a conducting system (Qazilbash et al., 2009b).”