基于理想共振隧穿的三端量子点热机

发布时间：2018-05-11 03:26

本文选题：三端量子点热机 + 电子传输　；参考：《中国科学:技术科学》2016年12期

【摘要】：由两个单能级量子点、一个腔和两个电子库耦合形成三端量子点热机模型.通过Landauer公式导出了热机的输出功率以及效率表达式,数值模拟出该热机功率与效率之间的性能特征图,确定了热机性能的优化范围.之后,在最大功率与最大效率作为优化目标下,分析了热漏和能级宽度对热机性能的影响.最后,讨论了在最大功率下对应的效率随卡诺效率变化的关系并且与CA效率进行了比较.研究表明:由于能级宽度和热漏的存在,该热机为一个不可逆热机,热机的效率和功率的特性为一个闭合曲线;由于存在热漏,热机效率和能级宽度的特性为非单调曲线;不考虑热漏和能级宽度,最大功率下的效率将大于CA效率.
[Abstract]:Two single-level quantum dots, one cavity and two electron libraries are coupled to form a three-terminal quantum dot thermal model. The expressions of output power and efficiency of heat engine are derived by Landauer formula. The performance characteristic diagram between power and efficiency of heat engine is numerically simulated, and the optimum range of performance of heat engine is determined. After that, the effects of heat leakage and energy level width on the performance of heat engine are analyzed under the optimal objectives of maximum power and maximum efficiency. Finally, the relationship between the corresponding efficiency and the Carnot efficiency under the maximum power is discussed and compared with the CA efficiency. The results show that because of the existence of energy level width and heat leakage, the heat engine is an irreversible heat engine, and the efficiency and power characteristics of the heat engine are a closed curve, and because of the heat leakage, the characteristics of the heat engine efficiency and the energy level width are non-monotone curves. When heat leakage and energy level width are not taken into account, the efficiency of the maximum power is greater than that of the CA.
【作者单位】：南昌大学物理系;
【基金】：国家自然科学基金(批准号:11365015)资助项目
【分类号】：TK05

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