Observation of excitonic effects in metallic single-walled carbon nanotubes

被引：24
|
作者：
May, Patrick [1 ]
Telg, Hagen [1 ]
Zhong, Guofang [2 ]
Robertson, John [2 ]
Thomsen, Christian [1 ]
Maultzsch, Janina [1 ]
机构：
[1] Tech Univ Berlin, Inst Festkorperphys, D-10623 Berlin, Germany
[2] Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 19期
关键词：
D O I：
10.1103/PhysRevB.82.195412
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Excitonic effects of metallic single-walled carbon nanotubes are measured with temperature-dependent resonant Raman spectroscopy. By changing the temperature in the range of 300-870 K, we observe variations in the optical transition energy E(ii) as well as in the maximum Raman intensity. We find both dependences to be different for semiconducting and metallic single-walled carbon nanotubes. We suggest an interpretation in terms of excitons dissociated into free electron-hole pairs at temperatures related to the exciton binding energy. We furthermore discuss how the oscillator strength is influenced by temperature.
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页数：6
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