Strong exciton-plasmon coupling in semiconducting carbon nanotubes

被引:60
作者
Bondarev, I. V. [1 ]
Woods, L. M. [2 ]
Tatur, K. [2 ]
机构
[1] N Carolina Cent Univ, Dept Phys, Durham, NC 27707 USA
[2] Univ S Florida, Dept Phys, Tampa, FL 33620 USA
基金
美国国家科学基金会;
关键词
binding energy; carbon nanotubes; elemental semiconductors; energy gap; excitons; quantum confined Stark effect; surface conductivity; surface plasmon resonance; SINGLE QUANTUM-DOT; OPTICAL-ABSORPTION; ELECTRONIC STATES; ENERGY; DEPENDENCE; ULTRALONG;
D O I
10.1103/PhysRevB.80.085407
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study theoretically the interactions of excitonic states with surface electromagnetic modes of small-diameter (less than or similar to 1 nm) semiconducting single-walled carbon nanotubes. We show that these interactions can result in strong exciton-surface-plasmon coupling. The exciton absorption line shape exhibits Rabi splitting similar to 0.1 eV as the exciton energy is tuned to the nearest interband surface-plasmon resonance of the nanotube. We also show that the quantum confined Stark effect may be used as a tool to control the exciton binding energy and the nanotube band gap in carbon nanotubes in order, e.g., to bring the exciton total energy in resonance with the nearest interband plasmon mode. The exciton-plasmon Rabi splitting we predict here for an individual carbon nanotube is close in its magnitude to that previously reported for hybrid plasmonic nanostructures artificially fabricated of organic semiconductors on metallic films. We expect this effect to open up paths to new tunable optoelectronic device applications of semiconducting carbon nanotubes.
引用
收藏
页数:20
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