Nanotextured Dynamics of a Light-Induced Phase Transition in VO2

Aaron J. Sternbach, Francesco L. Ruta, Yin Shi, Tetiana Slusar, Jacob Schalch, Guangwu Duan, Alexander S. McLeod, Xin Zhang, Mengkun Liu, Andrew J. Millis, Hyun Tak Kim, Long Qing Chen, Richard D. Averitt, D. N. Basov

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We investigate transient nanotextured heterogeneity in vanadium dioxide (VO2) thin films during a light-induced insulator-to-metal transition (IMT). Time-resolved scanning near-field optical microscopy (Tr-SNOM) is used to study VO2 across a wide parameter space of infrared frequencies, picosecond time scales, and elevated steady-state temperatures with nanoscale spatial resolution. Room temperature, steady-state, phonon enhanced nano-optical contrast reveals preexisting "hidden"disorder. The observed contrast is associated with inequivalent twin domain structures. Upon thermal or optical initiation of the IMT, coexisting metallic and insulating regions are observed. Correlations between the transient and steady-state nano-optical textures reveal that heterogeneous nucleation is partially anchored to twin domain interfaces and grain boundaries. Ultrafast nanoscopic dynamics enable quantification of the growth rate and bound the nucleation rate. Finally, we deterministically anchor photoinduced nucleation to predefined nanoscopic regions by locally enhancing the electric field of pump radiation using nanoantennas and monitor the on-demand emergent metallicity in space and time.

Original languageEnglish (US)
Pages (from-to)9052-9060
Number of pages9
JournalNano letters
Volume21
Issue number21
DOIs
StatePublished - Nov 10 2021
Externally publishedYes

Bibliographical note

Funding Information:
Work on correlated oxides at Columbia was supported by the Center on Precision-Assembled Quantum Materials, funded through the US National Science Foundation (NSF) Materials Research Science and Engineering Centers (award DMR-2011738). The development of nano-optical capabilities at Columbia is supported by NSF EFMA 1741660 and DARPA DRINQS Program under award number D18AC00014. D.N.B. is Moore Investigator in Quantum Materials EPIQS GBMF9455. D.N.B. is the Vannevar Bush Faculty Fellow ONR-VB: N00014-19-1-2630. We acknowledge support from the Institute of Information & Communications Technology Planning & Evaluation (IITP) grant funded by the Korean government (MSIT) [Grant 2017-0-00830] on MIT. J.S. and R.D.A. acknowledge ARO MURI Grant W911NF-16-1-0361. M.L. acknowledges support from the National Science Foundation under Grant DMR-1904576.

Publisher Copyright:
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Keywords

  • Nucleation and Growth
  • Phase Transition
  • Quantum Materials
  • Ultrafast Nanospectroscopy
  • Vanadium Dioxide
  • s-SNOM

PubMed: MeSH publication types

  • Journal Article

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