Plasmons in a free-standing nanorod with a two-dimensional parabolic quantum well caused by surface states |
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| Authors: | Song Ya-Feng L&# Yan-Wu Wen Wei Liu Xiang-Lin Yang Shao-Yan Zhu Qin-Sheng Wang Zhan-Guo |
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| Affiliation: | a. Key Laboratory of Semiconductor Materials Science, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China;b. Department of Physics, Beijing Jiaotong University, Beijing 100044, China;c. State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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| Abstract: | The collective charge density excitations in a free-standing nanorod with a two-dimensional parabolic quantum well are investigated within the framework of Bohm--Pine's random-phase approximation in the two-subband model. The new simplified analytical expressions of the Coulomb interaction matrix elements and dielectric functions are derived and numerically discussed. In addition, the electron density and temperature dependences of dispersion features are also investigated. We find that in the two-dimensional parabolic quantum well, the intrasubband upper branch is coupled with the intersubband mode, which is quite different from other quasi-one-dimensional systems like a cylindrical quantum wire with an infinite rectangular potential. In addition, we also find that higher temperature results in the intersubband mode (with an energy of 12 meV (～ 3 THz)) becoming totally damped, which agrees well with the experimental results of Raman scattering in the literature. These interesting properties may provide useful references to the design of free-standing nanorod based devices. |
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| Keywords: | plasmons two-dimensional parabolic quantum well terahertz nanodevices nanorod |
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