A Cooper-Pair Light-Emitting Diode: Temperature Dependence of Both Quantum Efficiency and Radiative Recombination Lifetime
A Cooper-Pair Light-Emitting Diode: Temperature Dependence of Both Quantum Efficiency and Radiative Recombination Lifetime
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DOI：
10.1143/apex.3.054001
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发表时间：
2010-01-01
影响因子：
2.3
通讯作者：
Kumano, Hidekazu
中科院分区：
文献类型：
--
作者：
Suemune, Ikuo;Hayashi, Yujiro;Kumano, Hidekazu
光纤通信波段的发光二极管（LED）在用铌（Nb）超导金属代替n型电极后显示出特殊的功能。Nb电极制备在InGaAs基半导体表面上形成超导体/半导体/超导体结，并且电流-电压特性表现出DC和AC约瑟夫森结特性。这是电子库珀对注入到发光二极管的n-InGaAs有源层的结果。在Nb超导临界温度T（c）以下观察到的电致发光输出的急剧增强表明了电子库珀对在辐射复合中的积极作用。这种LED的寿命测量和发光输出的准确评估使得有可能估计辐射复合寿命。导出的库珀对辐射复合的理论公式准确地描述了测量的急剧减少的辐射复合寿命和观察到的增强的内部量子效率低于Tc。这项工作将有助于跨学科物理学的发展和超导和光电子学的新应用。(C)2010日本应用物理学会
A light-emitting diode (LED) in the optical-fiber communication band showed special features after replacing the n-type electrode with niobium (Nb) superconducting metal. Nb electrodes prepared on an InGaAs-based semiconductor surface formed a superconductor/semiconductor/superconductor junction, and the current-voltage characteristics exhibited both DC and AC Josephson junction properties. This was a result of the injection of electron Cooper-pairs into the n-InGaAs active layer of an LED. The drastic enhancement of the electroluminescence output observed below the Nb superconducting critical temperature, T(c), demonstrates the active role of electron Cooper-pairs in radiative recombination. Lifetime measurements of this LED and accurate evaluation of the luminescence output made it possible to estimate the radiative recombination lifetimes. A theoretical formula derived for the Cooper-pair radiative recombination accurately describes both the measured steep reduction of the radiative recombination lifetime and the observed enhancement of the internal quantum efficiency below Tc. This work will assist the development of interdisciplinary physics and new applications in superconductivity and optoelectronics. (C) 2010 The Japan Society of Applied Physics