Tunneling breakdown of a strongly correlated insulating state in VO2 induced by intense multiterahertz excitation

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2015
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Ultrafast Quantum Physics in Amplitude and Phase - UltraPhase, ERC Advanced Grant
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Physical Review B. 2015, 91(23), 235113. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.91.235113
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We directly trace the near- and midinfrared transmission change of a VO2 thin film during an ultrafast insulator-to-metal transition triggered by high-field multiterahertz transients. Nonthermal switching into a metastable metallic state is governed solely by the amplitude of the applied terahertz field. In contrast to resonant excitation below the threshold fluence, no signatures of excitonic self-trapping are observed. Our findings are consistent with the generation of spatially separated charge pairs and a cooperative transition into a delocalized metallic state by THz field-induced tunneling. The tunneling process is a condensed-matter analog of the Schwinger effect in nonlinear quantum electrodynamics. We find good agreement with the pair production formula by replacing the Compton wavelength with an electronic correlation length of 2.1 Å.

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ISO 690MAYER, Bernhard, Christian SCHMIDT, Alexander GRUPP, Johannes BÜHLER, Jannis OELMANN, Robert E. MARVEL, Richard F. HAGLUND, Takashi OKA, Daniele BRIDA, Alfred LEITENSTORFER, Alexej PASHKIN, 2015. Tunneling breakdown of a strongly correlated insulating state in VO2 induced by intense multiterahertz excitation. In: Physical Review B. 2015, 91(23), 235113. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.91.235113
BibTex
@article{Mayer2015Tunne-32409,
  year={2015},
  doi={10.1103/PhysRevB.91.235113},
  title={Tunneling breakdown of a strongly correlated insulating state in VO<sub>2</sub> induced by intense multiterahertz excitation},
  number={23},
  volume={91},
  issn={1098-0121},
  journal={Physical Review B},
  author={Mayer, Bernhard and Schmidt, Christian and Grupp, Alexander and Bühler, Johannes and Oelmann, Jannis and Marvel, Robert E. and Haglund, Richard F. and Oka, Takashi and Brida, Daniele and Leitenstorfer, Alfred and Pashkin, Alexej},
  note={Article Number: 235113}
}
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