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Lasing behaviour from the condensation of polaronic excitons in a ZnO nanowire |
| Liu Rui-Bin(刘瑞斌) and Zou Bing-Suo(邹炳锁)† |
| Nanophotonics Laboratory, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China |
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Abstract Atoms under optical and magnetic trapping in a limited space at a very low temperature can lead to Bose-Einstein condensation (BEC), even in a one-dimensional (1D) optical lattice. However, can the confinment of dense excitons in a 1D semiconductor microstructure easily reach the excitonic BEC? A lightly Mn(II)-doped ZnO nanowire under a femtosecond laser pulse pump at room temperature produces single-mode lasing from coherent bipolaronic excitons, which is much like a macroscopic quantum state due to the condensation of the bipoaronic excitons if not real BEC. In this process, longitudinal biphonon binding with the exciton plays an important role. We revisit this system and propose possibility of bipolaronic exciton condensation. More studies are needed for this condensation phenomenon in 1D microcavity systems.
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Received: 20 September 2010
Revised: 12 November 2010
Accepted manuscript online:
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PACS:
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71.35.Lk
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(Collective effects (Bose effects, phase space filling, and excitonic phase transitions))
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71.55.Gs
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(II-VI semiconductors)
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72.80.Ey
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(III-V and II-VI semiconductors)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 90606001，20873039, and 51002011) and the Excellent Young Scholars Research Fund of Beijing Institute of Technology. |
Cite this article:
Liu Rui-Bin(刘瑞斌) and Zou Bing-Suo(邹炳锁) Lasing behaviour from the condensation of polaronic excitons in a ZnO nanowire 2011 Chin. Phys. B 20 047104
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