Tunable periodic evolution and quantum phase transition in mesoscopic two-band superconducting loops

Tunable periodic evolution and quantum phase transition in mesoscopic two-band superconducting loops
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介观双带超导环中的可调谐周期演化和量子相变

DOI:
10.1063/1.4808295
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发表时间:
2013-06
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, Qiang;Zhou, Shi-Ping

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通过数值求解广义Bogoliubov-de Gennes方程组,自洽地研究了介观双带非圆环超导态演化的磁通量依赖性.电流从hc / e-到hc/2 e-通量周期性的交叉可以通过增加带间耦合强度或温度来控制。对于足够小的带间耦合,两个带的序参数可以在窄的磁通范围内表现出不同的绕组数。此外,不同的模式的磁通量调谐的量子相变之间的超导状态和电阻/正常状态,这是强烈敏感的温度和强度的配对相互作用以及环的几何形状,在本双带样品中被证明。对于超导多层或有效多带系统,也可以预期类似的相干现象。
The magnetic flux dependence of the superconducting state evolution for mesoscopic two-band noncircular loops is studied by numerically solving the generalized Bogoliubov-de Gennes equations self-consistently. The crossover from hc / e- to hc/2e-flux periodicity of the current can be controlled by increasing the interband coupling strength or the temperature. For sufficiently small interband coupling, the order parameters of the two bands may exhibit different winding numbers in narrow flux ranges. Moreover, different patterns of flux-tuned quantum phase transitions between the superconducting state and the resistive/normal state, which are strongly sensitive to the temperature and the strength of the pairing interaction as well as the loop geometry, are demonstrated in the present two-band samples. Similar coherent phenomena are expected for the superconducting multi-layer or effectively multi-band systems.
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