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Imaging the nanoscale phase separation in vanadium dioxide thin films at terahertz frequencies.


ABSTRACT: Vanadium dioxide (VO2) is a material that undergoes an insulator-metal transition upon heating above 340?K. It remains debated as to whether this electronic transition is driven by a corresponding structural transition or by strong electron-electron correlations. Here, we use apertureless scattering near-field optical microscopy to compare nanoscale images of the transition in VO2 thin films acquired at both mid-infrared and terahertz frequencies, using a home-built terahertz near-field microscope. We observe a much more gradual transition when THz frequencies are utilized as a probe, in contrast to the assumptions of a classical first-order phase transition. We discuss these results in light of dynamical mean-field theory calculations of the dimer Hubbard model recently applied to VO2, which account for a continuous temperature dependence of the optical response of the VO2 in the insulating state.

SUBMITTER: Stinson HT 

PROVIDER: S-EPMC6127259 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Imaging the nanoscale phase separation in vanadium dioxide thin films at terahertz frequencies.

Stinson H T HT   Sternbach A A   Najera O O   Jing R R   Mcleod A S AS   Slusar T V TV   Mueller A A   Anderegg L L   Kim H T HT   Rozenberg M M   Basov D N DN  

Nature communications 20180906 1


Vanadium dioxide (VO<sub>2</sub>) is a material that undergoes an insulator-metal transition upon heating above 340 K. It remains debated as to whether this electronic transition is driven by a corresponding structural transition or by strong electron-electron correlations. Here, we use apertureless scattering near-field optical microscopy to compare nanoscale images of the transition in VO<sub>2</sub> thin films acquired at both mid-infrared and terahertz frequencies, using a home-built teraher  ...[more]

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