Far-infrared spectroscopy of single quantum dots in high magnetic fields
Far-infrared spectroscopy of single quantum dots in high magnetic fields
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DOI：
10.1103/physrevb.65.085315
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发表时间：
2002-02
影响因子：
3.7
通讯作者：
O. Astafiev;V. Antonov;T. Kutsuwa;S. Komiyama
中科院分区：
文献类型：
--
作者：
O. Astafiev;V. Antonov;T. Kutsuwa;S. Komiyama
用远红外单光子探测技术研究了GaAs/AlxGa 1 xAs单量子点的激发光谱。光谱由一个单一的共振线，其共振频率是百分之几大于回旋共振频率，但大大小于磁等离子体频率台面蚀刻量子点的早期发现通过标准的远红外透射光谱。发现谐振频率与量子点的抛物裸约束势的特征频率基本一致。并归因于科恩模式集体等离子体振荡的上分支的激发。
Excitation spectra of single GaAs/Al x Ga 1 x As quantum dots (QD's) are studied by using a technique of far-infrared single-photon detection. The spectra consist of a single resonance line, the resonance frequency of which is by several percent larger than the cyclotron-resonance frequency but is substantially smaller than the magnetoplasma frequencies of mesa-etched QD's earlier found through the standard far-infrared transmission spectroscopy. The resonance frequency is found to be in substantial agreement with the characteristic frequency of the parabolic bare confinement potential of the QD's. and is ascribed to the excitation of the upper branch of the Kohn-mode collective plasma oscillations.