| 嵌入并联量子点的介观A-B环内的"巨"持续电流 |
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| 引用本文： | 谌雄文,吴绍全.嵌入并联量子点的介观A-B环内的"巨"持续电流[J].四川师范大学学报(自然科学版),2005,28(1):76-79. |
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| 作者姓名： | 谌雄文 吴绍全 |
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| 作者单位： | 四川师范大学,物理系,四川,成都,610066 |
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| 基金项目： | 四川省应用基础研究和四川省教育厅自然科学科研基金资助项目 |
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| 摘 要： | 使用双杂质的Anderson模型的哈密顿,从理论上研究了一个嵌入并联耦合量子点(DQD)的介观A B环系统处在Kondo区时的基态性质,并用slave boson平均场方法求解了哈密顿.结果表明,在这个系统中,持续电流依赖于系统的宇称效应和尺寸大小;在强耦合区,电流的峰值与零(弱)耦合区相比,有显著地增强,这说明两个量子点可以相干耦合而形成人造分子.在未来的装置设计中这个系统是很有潜力的.
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| 关 键 词： | 持续电流 宇称效应 尺寸效应 Kondo效应 |
| 文章编号： | 1001-8395(2005)01-0076-04 |
| 修稿时间： | 2004年3月4日 |
The Persistent Current in a Mesoscopic A-B Ring with a Parallel-coupled Double Quantum Dots |
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| CHEN Xiong-wen,WU Shao-quan.The Persistent Current in a Mesoscopic A-B Ring with a Parallel-coupled Double Quantum Dots[J].Journal of Sichuan Normal University(Natural Science),2005,28(1):76-79. |
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| Authors: | CHEN Xiong-wen WU Shao-quan |
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| Abstract: | We theoretically study the properties of the ground state of a mesocopic ring with aparallel double quantum dot in the Kondo district by means of the two-inpurity Anderson Hamiltonian.The Hamiltonian is solved by means of Slave-Boson mean-field theory. It is shown that in this system the persistent current induced by a magnetic flux depends sensitively on both the parity of this system and the size of the ring which is reflected in the giant current peak in the strong coupling district. Two dots can be coupled coherently to form a man-made molecule. This system might be a possile candidate for future devices. |
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| Keywords: | Persistent current Parity effect Size effect Kondo effect |
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