Photoinduced metallic state in VO2 proved by the terahertz pump-probe spectroscopy

被引：142

作者：

Nakajima, M. ^{[1
]}

Takubo, N. ^{[1
]}

Hiroi, Z. ^{[1
]}

Ueda, Y. ^{[1
]}

Suemoto, T. ^{[1
]}

机构：

[1] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 01期

关键词：

D O I：

10.1063/1.2830664

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigated the ultrafast terahertz response to the photoexcitation for vanadium dioxide single crystals and thin films using the optical-pump terahertz-probe technique at room temperature. The optical excitation induced an ultrafast decrease of the transmittance of the terahertz radiation within 0.7 ps. Since we expect only the free carrier response in the terahertz range, the decrease of the transmittance is unambiguously assigned to the appearance of the high electronic conductivity due to free carriers. The conductivity increases more than ten times in the picosecond time range after photoexcitation and it is concluded that the electronic states are metallic.

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