Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids

被引：210

作者：

Tao, Zhensheng ^{[1
,2
,3
]}

Chen, Cong ^{[1
,2
,3
]}

Szilvasi, Tibor ^{[4
]}

Keller, Mark ^{[5
]}

Mavrikakis, Manos ^{[4
]}

Kapteyn, Henry ^{[1
,2
,3
]}

Murnane, Margaret ^{[1
,2
,3
]}

机构：

[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[2] Univ Colorado, JILA, Boulder, CO 80309 USA

[3] NIST, Boulder, CO 80309 USA

[4] Univ Wisconsin, Dept Chem & Biol Engn, Madison, WI 53706 USA

[5] NIST, Boulder, CO 80305 USA

来源：

SCIENCE | 2016年 / 353卷 / 6294期

基金：

美国国家科学基金会;

关键词：

ANGLE-RESOLVED PHOTOEMISSION; HIGH-HARMONIC-GENERATION; CHARGE-DENSITY-WAVE; SPECTROSCOPY; BAND; ELECTRONS; SURFACES; PULSES; METAL; NI;

D O I：

10.1126/science.aaf6793

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Attosecond spectroscopic techniques have made it possible to measure differences in transport times for photoelectrons from localized core levels and delocalized valence bands in solids. We report the application of attosecond pulse trains to directly and unambiguously measure the difference in lifetimes between photoelectrons born into free electron-like states and those excited into unoccupied excited states in the band structure of nickel (111). An enormous increase in lifetime of 212 +/- 30 attoseconds occurs when the final state coincides with a short-lived excited state. Moreover, a strong dependence of this lifetime on emission angle is directly related to the final-state band dispersion as a function of electron transverse momentum. This finding underscores the importance of the material band structure in determining photoelectron lifetimes and corresponding electron escape depths.

引用

页码：62 / 67

页数：6

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