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Ultrafast insulator-metal phase transition in VO<sub>2</sub> studied by multiterahertz spectroscopy

Ultrafast insulator-metal phase transition in VO2 studied by multiterahertz spectroscopy

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PASHKIN, Alexej, Carl KÜBLER, Henri EHRKE, Ricardo LOPEZ, Andrej HALABICA, Richard HAGLUND, Rupert HUBER, Alfred LEITENSTORFER, 2011. Ultrafast insulator-metal phase transition in VO2 studied by multiterahertz spectroscopy. In: Physical Review B. 83(19). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.83.195120

@article{Pashkin2011Ultra-17694, title={Ultrafast insulator-metal phase transition in VO2 studied by multiterahertz spectroscopy}, year={2011}, doi={10.1103/PhysRevB.83.195120}, number={19}, volume={83}, issn={1098-0121}, journal={Physical Review B}, author={Pashkin, Alexej and Kübler, Carl and Ehrke, Henri and Lopez, Ricardo and Halabica, Andrej and Haglund, Richard and Huber, Rupert and Leitenstorfer, Alfred} }

eng Ultrafast insulator-metal phase transition in VO<sub>2</sub> studied by multiterahertz spectroscopy Lopez, Ricardo The ultrafast photoinduced insulator-metal transition in VO2 is studied at different temperatures and excitation fluences using multi-THz probe pulses. The spectrally resolved midinfrared response allows us to trace separately the dynamics of lattice and electronic degrees of freedom with a time resolution of 40 fs. The critical fluence of the optical pump pulse, which drives the system into a long-lived metallic state, is found to increase with decreasing temperature. Under all measurement conditions, we observe a modulation of the eigenfrequencies of the optical phonon modes induced by their anharmonic coupling to the coherent wave-packet motion of V-V dimers at 6.1 THz. Furthermore, we find a weak quadratic coupling of the electronic response to the coherent dimer oscillation resulting in a modulation of the electronic conductivity at twice the frequency of the wave-packet motion. The findings are discussed in the framework of a qualitative model based on an approximation of local photoexcitation of the vanadium dimers from the insulating state. Haglund, Richard Leitenstorfer, Alfred Pashkin, Alexej Pashkin, Alexej Halabica, Andrej Kübler, Carl Ehrke, Henri Lopez, Ricardo 2012-02-29T10:29:15Z deposit-license Leitenstorfer, Alfred First publ. in: Physical Review B ; 83 (2011), 19. - 195120 Ehrke, Henri Huber, Rupert 2011 Haglund, Richard Halabica, Andrej Kübler, Carl 2012-02-29T10:29:15Z Huber, Rupert

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