Coherent structural dynamics and electronic correlations during an ultrafast insulator-to-metal phase transition in VO2

被引：376

作者：

Kuebler, C.

Ehrke, H.

Huber, R. ^{[1
]}

Lopez, R.

Halabica, A.

Haglund, R. F., Jr.

Leitenstorfer, A.

机构：

[1] Univ Konstanz, Ctr Appl Photon, Dept Phys, D-78457 Constance, Germany

[2] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[3] Univ N Carolina, Inst Adv Mat Nanosci & Technol, Dept Phys & Astron, Chapel Hill, NC 27599 USA

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 99卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.99.116401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

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页数：4

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