Ultrafast disordering of vanadium dimers in photoexcited VO 2 | Zendy

Simon Wall | Zendy; Shan Yang | Zendy; Luciana Vidas | Zendy; Matthieu Chollet | Zendy; James M. Glownia | Zendy; M. Kozina | Zendy; Tetsuo Katayama | Zendy; Thomas Henighan | Zendy; Mason Jiang | Zendy; T. Miller | Zendy; David A. Reis | Zendy; L. A. Boatner | Zendy; Olivier Delaire | Zendy; Mariano Trigo | Zendy

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Ultrafast disordering of vanadium dimers in photoexcited VO ₂

Author(s) -

Simon Wall,

Shan Yang,

Luciana Vidas,

Matthieu Chollet,

James M. Glownia,

M. Kozina,

Tetsuo Katayama,

Thomas Henighan,

Mason Jiang,

T. Miller,

David A. Reis,

L. A. Boatner,

Olivier Delaire,

Mariano Trigo

Publication year - 2018

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.aau3873

Subject(s) - photoexcitation , femtosecond , ultrashort pulse , chemical physics , ultrafast electron diffraction , phase transition , diffraction , materials science , phase (matter) , vanadium , oscillation (cell signaling) , chemistry , molecular physics , atomic physics , crystallography , laser , excited state , condensed matter physics , optics , physics , biochemistry , organic chemistry , metallurgy

Snapshots of a phase transition Time-resolved x-ray scattering can be used to investigate the dynamics of materials during the switch from one structural phase to another. So far, methods provide an ensemble average and may miss crucial aspects of the detailed mechanisms at play. Wallet al. used a total-scattering technique to probe the dynamics of the ultrafast insulator-to-metal transition of vanadium dioxide (VO2 ) (see the Perspective by Cavalleri). Femtosecond x-ray pulses provide access to the time- and momentum-resolved dynamics of the structural transition. Their results show that the photoinduced transition is of the order-disorder type, driven by an ultrafast change in the lattice potential that suddenly unlocks the vanadium atoms and yields large-amplitude uncorrelated motions, rather than occurring through a coherent displacive mechanism.Science , this issue p.572 ; see also p.525

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