Coherence in laser-driven electrons at the surface and in the volume of solid matter

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• 作者：Peter Hommelhoff
• 刊名：Applied Physics B
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：123
• 期：1
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics, general; Physical Chemistry; Optics, Lasers, Photonics, Optical Devices; Quantum Optics; Engineering, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-0649
• 卷排序：123

文摘

The femtosecond frequency comb allows controlling the carrier field of ultrashort laser pulses. We show two examples on how this control over fields oscillating with a few hundred terahertz can be utilized to control electrons at the surface and in the volume of solids. After a brief discussion of strong-field physics at metal needle tips, we show how ultrafast two-color laser pulses allow quantum path interference to dramatically alter the emission current from sharp tips, with an interference visibility of 94%. With carrier-envelope phase-controlled laser pulses, we show furthermore how light-field sensitive currents can be excited in monolayer graphene via an interplay of interband and intraband electron dynamics including multiple Landau–Zener transitions.