Hot electron injection driven phase transitions

Masaki Hada; Dongfang Zhang; Albert Casandruc; R. J.Dwayne Miller; Yusaku Hontani; Jiro Matsuo; Robert E. Marvel; Richard F. Haglund

doi:10.1103/PhysRevB.86.134101

Hot electron injection driven phase transitions

Masaki Hada, Dongfang Zhang, Albert Casandruc, R. J.Dwayne Miller, Yusaku Hontani, Jiro Matsuo, Robert E. Marvel, Richard F. Haglund

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

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 VO ₂ 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.

Original language	English
Article number	134101
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	86
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.86.134101
Publication status	Published - Oct 1 2012
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.86.134101

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AU - Zhang, Dongfang

AU - Casandruc, Albert

AU - Miller, R. J.Dwayne

AU - Hontani, Yusaku

AU - Matsuo, Jiro

AU - Marvel, Robert E.

AU - Haglund, Richard F.

PY - 2012/10/1

Y1 - 2012/10/1

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AB - 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 VO 2 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.

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Hot electron injection driven phase transitions

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