We combine ultrafast pump-probe spectroscopy with a diamond-anvil cell to decouple the insulator-metal electronic transition from the lattice symmetry changing structural transition in the archetypal strongly correlated material vanadium dioxide. Coherent phonon spectroscopy enables tracking of the photo-excited phonon vibrational frequencies of the low temperature, monoclinic (M1)-insulating phase that transforms into the metallic, tetragonal rutile structured phase at high temperature or via non-thermal photo-excitations. We find that in contrast with ambient pressure experiments where strong photo-excitation promptly induces the electronic transition along with changes in the lattice symmetry, at high pressure, the coherent phonons of the monoclinic (M1) phase are still clearly observed upon the photo-driven phase transition to a metallic state. These results demonstrate the possibility of synthesizing and studying transient phases under extreme conditions.
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13 January 2014
Research Article|
January 16 2014
Evidence for photo-induced monoclinic metallic VO2 under high pressure
Wen-Pin Hsieh;
Wen-Pin Hsieh
1
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
2
Department of Geological and Environmental Sciences, Stanford University
, Stanford, California 94305, USA
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Mariano Trigo;
Mariano Trigo
1
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
3
Stanford PULSE Institute, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
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David A. Reis;
David A. Reis
1
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
3
Stanford PULSE Institute, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
4
Department of Photon Science and Applied Physics, Stanford University
, Stanford, California 94305, USA
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Gianluca Andrea Artioli;
Gianluca Andrea Artioli
5
Dipartimento di Chimica, Sezione di Chimica Fisica, INSTM (UdR Pavia), Università di Pavia
, Viale Taramelli 16, 27100 Pavia, Italy
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Lorenzo Malavasi;
Lorenzo Malavasi
5
Dipartimento di Chimica, Sezione di Chimica Fisica, INSTM (UdR Pavia), Università di Pavia
, Viale Taramelli 16, 27100 Pavia, Italy
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Wendy L. Mao
Wendy L. Mao
1
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
, Menlo Park, California 94025, USA
2
Department of Geological and Environmental Sciences, Stanford University
, Stanford, California 94305, USA
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b)
Present address: Institute of Earth Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan.
Appl. Phys. Lett. 104, 021917 (2014)
Article history
Received:
December 06 2013
Accepted:
December 31 2013
Citation
Wen-Pin Hsieh, Mariano Trigo, David A. Reis, Gianluca Andrea Artioli, Lorenzo Malavasi, Wendy L. Mao; Evidence for photo-induced monoclinic metallic VO2 under high pressure. Appl. Phys. Lett. 13 January 2014; 104 (2): 021917. https://doi.org/10.1063/1.4862197
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