Magnetic Brightening of Carbon Nanotube Photoluminescence through Symmetry Breaking
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- 作者：Jonah Shaver ; Junichiro Kono ; Oliver Portugall ; Vojislav Krsti
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- 刊名：Nano Letters
- 出版年：2007
- 出版时间：July 2007
- 年：2007
- 卷：7
- 期：7
- 页码：1851 - 1855
- 全文大小：222K
- 年卷期：v.7,no.7(July 2007)
- ISSN：1530-6992
文摘
We report that symmetry breaking by a magnetic field can drastically increase the photoluminescence quantum yield of single-walled carbonnanotubes, by as much as a factor of 6, at low temperatures. To explain this we have developed a theoretical model based on field-dependentexciton band structure and the interplay of Coulomb interactions and the Aharonov-Bohm effect. This conclusively explains our data as thefirst experimental observation of dark excitons 5-10 meV below the bright excitons.