Quasi-one-dimensional density of states in a single quantum ring.
Quasi-one-dimensional density of states in a single quantum ring.
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DOI：
10.1038/srep40026
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发表时间：
2017-01-05
影响因子：
4.6
通讯作者：
Song JD
中科院分区：
文献类型：
--
作者：
Kim H;Lee W;Park S;Kyhm K;Je K;Taylor RA;Nogues G;Dang LS;Song JD
通常，限制尺寸被认为是确定纳米结构的维度。在光学实验中，激子玻尔半径被用来定义弱约束或强约束，而约束激子的结合能很难在实验上测量。一种替代方法是使用辐射复合时间的温度依赖性，这在以前的量子威尔斯和量子线中已经被采用。通常假设一个一维的圈结构来模拟量子环，但是当圈的宽度变得与环的半径相当时，这种近似就不再有效了。通过测量激子辐射复合的温度依赖性，我们评估了单个量子环中的态密度，其中作为温度的函数的光致发光衰减时间通过使用低温积分强度和线宽被校准。我们的结论是，准连续的精细间隔的水平所产生的旋转能量引起的准一维态密度，只要被限制的激子被允许旋转周围的各向异性的环结构，它具有有限的边缘宽度的开口。
Generally confinement size is considered to determine the dimensionality of nanostructures. While the exciton Bohr radius is used as a criterion to define either weak or strong confinement in optical experiments, the binding energy of confined excitons is difficult to measure experimentally. One alternative is to use the temperature dependence of the radiative recombination time, which has been employed previously in quantum wells and quantum wires. A one-dimensional loop structure is often assumed to model quantum rings, but this approximation ceases to be valid when the rim width becomes comparable to the ring radius. We have evaluated the density of states in a single quantum ring by measuring the temperature dependence of the radiative recombination of excitons, where the photoluminescence decay time as a function of temperature was calibrated by using the low temperature integrated intensity and linewidth. We conclude that the quasi-continuous finely-spaced levels arising from the rotation energy give rise to a quasi-one-dimensional density of states, as long as the confined exciton is allowed to rotate around the opening of the anisotropic ring structure, which has a finite rim width.
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影响因子：
8.6
作者：
Ribeiro, E;Govorov, AO;Medeiros-Ribeiro, G
通讯作者：
Medeiros-Ribeiro, G
影响因子：
1.6
作者：
Fomin, V. M.;Gladilin, V. N.;Koenraad, P. M.
通讯作者：
Koenraad, P. M.
影响因子：
8.6
作者：
AKIYAMA, H;KOSHIBA, S;SAKAKI, H
通讯作者：
SAKAKI, H
影响因子：
8.6
作者：
FELDMANN, J;PETER, G;ELLIOTT, RJ
通讯作者：
ELLIOTT, RJ
影响因子：
3.7
作者：
Govorov, AO;Ulloa, SE;Warburton, RJ
通讯作者：
Warburton, RJ