期刊
NATURE COMMUNICATIONS
卷 2, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/ncomms1598
关键词
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资金
- Japan Society for the Promotion of Science [21760038]
- Ministry of Education, Culture, Sports, Science and Technology, Japan [20104007, 18GS0208]
- Grants-in-Aid for Scientific Research [21760038, 10J00534, 20104007] Funding Source: KAKEN
The study of carrier multiplication has become an essential part of many-body physics and materials science as this multiplication directly affects nonlinear transport phenomena, and has a key role in designing efficient solar cells and electroluminescent emitters and highly sensitive photon detectors. Here we show that a 1-MVcm(-1) electric field of a terahertz pulse, unlike a DC bias, can generate a substantial number of electron - hole pairs, forming excitons that emit near-infrared luminescence. The bright luminescence associated with carrier multiplication suggests that carriers coherently driven by a strong electric field can efficiently gain enough kinetic energy to induce a series of impact ionizations that can increase the number of carriers by about three orders of magnitude on the picosecond time scale.
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