Coherence in laser-driven electrons at the surface and in the volume of solid matter
Coherence in laser-driven electrons at the surface and in the volume of solid matter
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DOI：
10.1007/s00340-016-6586-6
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发表时间：
2016
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影响因子：
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通讯作者：
P. Hommelhoff
中科院分区：
文献类型：
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作者：
P. Hommelhoff
飞秒频率梳可以控制超短激光脉冲的载波场。我们展示了两个例子，说明如何利用对数百太赫兹振荡场的控制来控制固体表面和体积中的电子。在简要讨论金属针尖的强场物理之后，我们展示了超快双色激光脉冲如何允许量子路径干涉显着改变尖锐针尖的发射电流，干涉可见度高达 94%。利用载流子包络相控激光脉冲，我们进一步展示了如何通过带间和带内电子动力学（包括多个朗道-齐纳跃迁）的相互作用在单层石墨烯中激发光场敏感电流。
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.