Geometric effect on the phase transition in mesoscopic loops threaded by an Aharonov-Bohm flux

Geometric effect on the phase transition in mesoscopic loops threaded by an Aharonov-Bohm flux
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阿哈罗诺夫-玻姆通量对介观环相变的几何效应

DOI:
10.1063/1.4742051
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发表时间:
2012-08
影响因子:
3.2
通讯作者:
Zhou, Shi-Ping
Zhou, Shi-Ping
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Zha, Guo-Qiao;Wang, Shan-Shan;Wang, Jing-Chao;Zhou, Shi-Ping

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通过自洽数值求解Bogoliubov-de Gennes方程,系统地研究了Aharonov-Bohm磁通穿过的介观非圆环中的量子相变.我们重点研究了对称和非对称样品中s波超导序参量和电流与磁通量的关系。同时还讨论了位于样品内、外缘的表面凹陷或凸起缺陷对周期振荡的影响。我们发现了各种hc/e通量的周期性演化模式,并且除了超导态的相变外,还发现了超导态和电阻态/正常态之间的周期性相变。我们的研究可能会为材料工程提供新的思路,并为超导量子器件的设计提供重要的见解。
The quantum phase transition in mesoscopic noncircular loops threaded by an Aharonov-Bohm flux is systematically investigated by numerically solving the Bogoliubov-de Gennes equations self-consistently. We focus on the magnetic flux dependence of the s-wave superconducting order parameter and current in symmetric and asymmetric samples. The influence of surface indentation or bulge defects positioned at the inner or outer edge of the sample on the periodic oscillation is also discussed. We find various hc/e-flux periodicity evolution patterns, and the periodic phase transitions between the superconducing state and the resistive/normal state are demonstrated besides the superconducing state transitions. Our investigation may shed new light on material engineering and provide important insights to designing superconducting quantum devices.
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