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Journal Article

Hot electron injection driven phase transitions


Casandruc,  Albert
Atomically Resolved Structural Dynamics Division, Max Planck Research Department for Structural Dynamics, Department of Physics, University of Hamburg, External Organizations;
Center for Free Electron Laser Science, Notkestraße 85, Hamburg 22607, Germany;
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Hada, M., Zhang, D., Casandruc, A., Miller, R. J. D., Hontani, Y., Matsuo, J., et al. (2012). Hot electron injection driven phase transitions. Physical Review B, 86(13): 134101. doi:10.1103/PhysRevB.86.134101.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-18D5-2
We report on a general mechanism for photo-induced phase transitions. The process relies on the photo-injection of hot electrons from an adjacent metallic layer to trigger the structural dynamics of the materials of interest. This mechanism is demonstrated for the semiconductor-to-metal phase transition of VO2 using a 20 nm Au injection layer. The nature of the phase transition is demonstrated by time-resolved optical transmission measurements, as well as a well defined bias dependence that illustrates that the Au film is the source of nonequilibrium electrons driving the phase transition.