Quantum and classical resonant escapes of a strongly driven Josephson junction
文献类型：期刊论文
| 作者 | Yu, HF ; Zhu, XB ; Peng, ZH ; Cao, WH ; Cui, DJ ; Tian, Y ; Chen, GH ; Zheng, DN ; Jing, XN ; Lu, L ; Zhao, SP ; Han, S |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2010 |
| 卷号 | 81期号:14 |
| 关键词 | ZERO-VOLTAGE STATE ENERGY-LEVEL QUANTIZATION TUNNEL-JUNCTIONS OSCILLATIONS IMPEDANCE LIFETIME FIELD |
| ISSN号 | 1098-0121 |
| 通讯作者 | Yu, HF (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China. |
| 中文摘要 | The properties of phase escape in a dc superconducting quantum interference device (SQUID) at 25 mK, which is well below quantum-to-classical crossover temperature T(cr), in the presence of strong resonant ac driving have been investigated. The SQUID contains two Nb/Al-AlO(x)/Nb tunnel junctions with Josephson inductance much larger than the loop inductance so it can be viewed as a single junction having adjustable critical current. We find that with increasing microwave power W and at certain frequencies nu and nu/2, the single primary peak in the switching current distribution, which is the result of macroscopic quantum tunneling of the phase across the junction, first shifts toward lower bias current I and then a resonant peak develops. These results are explained by quantum resonant phase escape involving single and two photons with microwave-suppressed potential barrier. As W further increases, the primary peak gradually disappears and the resonant peak grows into a single one while shifting further to lower I. At certain W, a second resonant peak appears, which can locate at very low I depending on the value of nu. Analysis based on the classical equation of motion shows that such resonant peak can arise from the resonant escape of the phase particle with extremely large oscillation amplitude resulting from bifurcation of the nonlinear system. Our experimental result and theoretical analysis demonstrate that at T << T(cr), escape of the phase particle could be dominated by classical process, such as dynamical bifurcation of nonlinear systems under strong ac driving. |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China [10534060, 10874231]; Ministry of Science and Technology of China [2006CB601007, 2006CB921107, 2009CB929102]; NSF [DMR-0325551] |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51635]  |
| 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 | Yu, HF,Zhu, XB,Peng, ZH,et al. Quantum and classical resonant escapes of a strongly driven Josephson junction[J]. PHYSICAL REVIEW B,2010,81(14). |
| APA | Yu, HF.,Zhu, XB.,Peng, ZH.,Cao, WH.,Cui, DJ.,...&Han, S.(2010).Quantum and classical resonant escapes of a strongly driven Josephson junction.PHYSICAL REVIEW B,81(14). |
| MLA | Yu, HF,et al."Quantum and classical resonant escapes of a strongly driven Josephson junction".PHYSICAL REVIEW B 81.14(2010). |
入库方式： OAI收割
来源：物理研究所
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