Supercurrent and its Fano effect in a Josephson Aharonov-Bohm ring
文献类型：期刊论文
| 作者 | Cheng, SG ; Xing, YX ; Xie, XC ; Sun, QF |
| 刊名 | EUROPEAN PHYSICAL JOURNAL B
 |
| 出版日期 | 2009 |
| 卷号 | 67期号:4页码:551 |
| 关键词 | QUANTUM-DOT JUNCTIONS SYSTEM TRANSMISSION TRANSPORT |
| ISSN号 | 1434-6028 |
| 通讯作者 | Cheng, SG (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | The Josephson current through an Aharonov-Bohm (AB) interferometer, in which a quantum dot (QD) is situated on one arm and a magnetic flux I broken vertical bar threads through the ring, has been investigated. In the presence of the magnetic flux, the relation between the Josephson current and the superconductor phase is complex, and the system can be adjusted to pi junction by either modulating the magnetic flux or the QD's energy level epsilon(d). Due to the electron-hole symmetry, the Josephson current I has the property I(epsilon(d),I broken vertical bar)=I(-epsilon(d),I broken vertical bar+pi). The Josephson current exhibits a jump when a pair of Andreev bound states aligns with the Fermi energy. The condition for the current jump is given. Particularly, we find that the position of the current jump and the position of the maximum value of the critical current I(c) are identical. Due to the interference between the two paths, the critical current I(c) versus the QD's level epsilon(d) shows a typical Fano shape, which is similar to the Fano effect in the corresponding normal device. However they also show some differences. For example, the critical current never reaches zero for any parameters, while the current in the normal device can reach zero at the destruction point. |
| 收录类别 | SCI |
| 资助信息 | Chinese Academy of Sciences; NSF-China [10525418, 10734110, 60776060]; US-DOE [DE-FG02-04ER46124]; NSF |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/54103]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Cheng, SG,Xing, YX,Xie, XC,et al. Supercurrent and its Fano effect in a Josephson Aharonov-Bohm ring[J]. EUROPEAN PHYSICAL JOURNAL B,2009,67(4):551. |
| APA | Cheng, SG,Xing, YX,Xie, XC,&Sun, QF.(2009).Supercurrent and its Fano effect in a Josephson Aharonov-Bohm ring.EUROPEAN PHYSICAL JOURNAL B,67(4),551. |
| MLA | Cheng, SG,et al."Supercurrent and its Fano effect in a Josephson Aharonov-Bohm ring".EUROPEAN PHYSICAL JOURNAL B 67.4(2009):551. |
入库方式： OAI收割
来源：物理研究所
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