Ferroelectric Soft Mode in a SrTiO3 Thin Film Impulsively Driven to the Anharmonic Regime Using Intense Picosecond Terahertz Pulses

被引：132

作者：

Katayama, I. ^{[1
]}

Aoki, H. ^{[2
]}

Takeda, J. ^{[2
]}

Shimosato, H. ^{[3
]}

Ashida, M. ^{[3
,4
]}

Kinjo, R. ^{[5
]}

Kawayama, I. ^{[5
]}

Tonouchi, M. ^{[5
]}

Nagai, M. ^{[4
,6
]}

Tanaka, K. ^{[6
,7
,8
]}

机构：

[1] Yokohama Natl Univ, Interdisciplinary Res Ctr, Yokohama, Kanagawa 2408501, Japan

[2] Yokohama Natl Univ, Grad Sch Engn, Yokohama, Kanagawa 2408501, Japan

[3] Osaka Univ, Grad Sch Engn Sci, Toyonaka, Osaka 5608531, Japan

[4] PRESTO JST, Tokyo 1020075, Japan

[5] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650871, Japan

[6] Kyoto Univ, Grad Sch Sci, Kyoto 6068502, Japan

[7] iCeMS, Kyoto 6068501, Japan

[8] CREST JST, Tokyo 1020075, Japan

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 09期

基金：

日本科学技术振兴机构;

关键词：

LATTICE-VIBRATIONS; STRONTIUM-TITANATE; RAMAN-SCATTERING; GENERATION; OPTICS;

D O I：

10.1103/PhysRevLett.108.097401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The ferroelectric soft mode in a SrTiO3 thin film was impulsively driven to a large amplitude using intense picosecond terahertz pulses. As the terahertz electric field increased, the soft-mode absorption peak exhibited blueshifting and spectral narrowing. A classical anharmonic oscillator model suggests that the induced displacement is comparable to that of the ferroelectric phase transition. The spectral narrowing indicates that the displacement exceeds that induced by any inhomogeneities in the film, demonstrating that the method can be used to explore intrinsic quartic anharmonicity.

引用

页数：5

共 32 条

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