Femtosecond time-resolved dynamical Franz-Keldysh effect

被引：56

作者：

Otobe, T. ^{[1
]}

Shinohara, Y. ^{[2
]}

Sato, S. A. ^{[3
]}

Yabana, K. ^{[1
,3
,4
]}

机构：

[1] Japan Atom Energy Agcy, Kansai Photon Sci Inst, Kyoto 6190615, Japan

[2] Max Planck Inst Mikrostrukturphys, D-06120 Halle, Germany

[3] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

[4] Univ Tsukuba, Ctr Computat Sci, Tsukuba, Ibaraki 3058577, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 04期

关键词：

DENSITY-FUNCTIONAL THEORY; REAL-TIME; FIELD; ELECTROABSORPTION; PSEUDOPOTENTIALS; MODULATION; SYSTEMS; SPACE;

D O I：

10.1103/PhysRevB.93.045124

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We theoretically investigate the dynamical Franz-Keldysh effect in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function at around the band gap under an irradiation of an intense laser field. We develop a pump-probe formalism in two distinct approaches: first-principles simulation based on real-time time-dependent density functional theory and analytic consideration of a simple two-band model. We find that, while time-average modulation can be reasonably described by the static Franz-Keldysh theory, a remarkable phase shift is found to appear between the dielectric response and the applied electric field.

引用

页数：9

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