Response time of a normal-metal/superconductor hybrid system under a step-like pulse bias
文献类型：期刊论文
| 作者 | Xing, YX ; Sun, QF ; Wang, J |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2007 |
| 卷号 | 75期号:12 |
| 关键词 | SUPERCONDUCTING TUNNEL-JUNCTIONS QUANTUM-DOT JOSEPHSON CURRENT TRANSPORT SPECTROSCOPY IMPURITY MODEL FLOW |
| ISSN号 | 1098-0121 |
| 通讯作者 | Xing, YX (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China. |
| 中文摘要 | The response of a quantum dot coupled with one normal lead and a superconductor lead driven by a step-like pulse bias V-L is studied using the nonequilibrium Green's function method. In the linear pulse bias regime, the responses of the upward and downward biases are symmetric. In this regime, the turn-on time and turn-off time are much slower than those of the normal system due to the Andreev reflection. On the other hand, for the large pulse bias V-L, the instantaneous current exhibits oscillatory behaviors with the frequency h Omega=qV(L). The turn-on/off times are in (or shorter than) the scale of 1/V-L, so they are faster for the larger bias V-L. In addition, the responses for the upward and downward biases are asymmetric at large V-L. The turn-on time is larger than the turn-off time, but the relaxation time depends only on the coupling strength Gamma and it is much smaller than the turn-on/off times for the large bias V-L. [The turn-on/off time describes how fast a device can turn on/off a current, which is also named rise/fall time in M. Plihal , Phys. Rev. B 61, R13341 (2000), while the relaxation time was referred to how fast the device can go to a new steady state after a bias is abruptly switched on. It is also named saturation time in A. Schiller and S. Hershfield, Phys. Rev. B 62, R16271 (2000).] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/52143]  |
| 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 | Xing, YX,Sun, QF,Wang, J. Response time of a normal-metal/superconductor hybrid system under a step-like pulse bias[J]. PHYSICAL REVIEW B,2007,75(12). |
| APA | Xing, YX,Sun, QF,&Wang, J.(2007).Response time of a normal-metal/superconductor hybrid system under a step-like pulse bias.PHYSICAL REVIEW B,75(12). |
| MLA | Xing, YX,et al."Response time of a normal-metal/superconductor hybrid system under a step-like pulse bias".PHYSICAL REVIEW B 75.12(2007). |
入库方式： OAI收割
来源：物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。