Kübler, C. and Ehrke, H. and Huber, Rupert and Lopez, R. and Halabica, A. and Haglund jun., R. F. and Leitenstorfer, A.
Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition in VO2.
Physical Review Letters (PRL) 99 (11), p. 116401.
We directly trace the multi-THz conductivity of VO2 during an insulator-metal transition triggered by a 12-fs light pulse. The femtosecond dynamics of lattice and electronic degrees of freedom are spectrally discriminated. A coherent wave packet motion of V-V dimers at 6 THz modulates the lattice polarizability for approximately 1 ps. In contrast, the electronic conductivity settles to a constant value already after one V-V oscillation cycle. Based on our findings, we propose a qualitative model for the nonthermal phase transition.
|Additional information (public):||» This publication has been selected for the Virtual Journal of Ultrafast Science
» This publication has been selected for the Virtual Journal of Nanoscale Science and Technology|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||28 Jan 2011 07:20|
|Last Modified:||21 Jul 2011 02:05|