期刊
SCIENTIFIC REPORTS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep25655
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资金
- JSPS through its FIRST Program
- JSPS through KAKENHI Grant [20104008, 24740277, 25800181, 26287087, 26790061, 16K05492]
- Space and Naval Warfare Systems (SPAWAR) [N66001-09-1-2024]
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Project for Developing Innovation Systems of MEXT
- National Institute of Information and Communications Technology (NICT)
- joint study program at the Institute for Molecular Science
- Shanghai Research Challenge Fund
- NSFC
- NTT Basic Laboratories
- Toray Science Foundation
- KDDI foundation
- REFEC
- National Natural Science Foundation of China [61571301]
- Thousand Talents Program for Distinguished Young Scholars
- New York University Global Seed Grants for Collaborative Research
- Grants-in-Aid for Scientific Research [16K05492] Funding Source: KAKEN
In a standard semiconductor laser, electrons and holes recombine via stimulated emission to emit coherent light, in a process that is far from thermal equilibrium. Exciton-polariton condensates-sharing the same basic device structure as a semiconductor laser, consisting of quantum wells coupled to a microcavity-have been investigated primarily at densities far below the Mott density for signatures of Bose-Einstein condensation. At high densities approaching the Mott density, exciton-polariton condensates are generally thought to revert to a standard semiconductor laser, with the loss of strong coupling. Here, we report the observation of a photoluminescence sideband at high densities that cannot be accounted for by conventional semiconductor lasing. This also differs from an upper-polariton peak by the observation of the excitation power dependence in the peak-energy separation. Our interpretation as a persistent coherent electron-hole-photon coupling captures several features of this sideband, although a complete understanding of the experimental data is lacking. A full understanding of the observations should lead to a development in non-equilibrium many-body physics.
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