期刊
NATURE
卷 523, 期 7562, 页码 572-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nature14652
关键词
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资金
- European Research Council [305003]
- Deutsche Forschungsgemeinschaft [HU 1598/2-1, SFB 1083, KI 917/2-2]
- European Research Council (ERC) [305003] Funding Source: European Research Council (ERC)
Acceleration and collision of particles has been a key strategy for exploring the texture of matter. Strong light waves can control and recollide electronic wavepackets, generating high-harmonic radiation that encodes the structure and dynamics of atoms and molecules and lays the foundations of attosecond science(1-3). The recent discovery of high-harmonic generation in bulk solids(4-6) combines the idea of ultrafast acceleration with complex condensed matter systems, and provides hope for compact solid-state attosecond sources(6-8) and electronics at optical frequencies(3,5,9,10). Yet the underlying quantum motion has not so far been observable in real time. Here we study high-harmonic generation in a bulk solid directly in the time domain, and reveal a new kind of strong-field excitation in the crystal. Unlike established atomic sources(1-3,9,11), our solid emits high-harmonic radiation as a sequence of subcycle bursts that coincide temporally with the field crests of one polarity of the driving terahertz waveform. We show that these features are characteristic of a non-perturbative quantum interference process that involves electrons from multiple valence bands. These results identify key mechanisms for future solid-state attosecond sources and next-generation light-wave electronics. The new quantum interference process justifies the hope for all-optical band-structure reconstruction and lays the foundation for possible quantum logic operations at optical clock rates.
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