Magnetic flux periodicity in mesoscopic d -wave symmetric and asymmetric superconducting loops
Magnetic flux periodicity in mesoscopic d -wave symmetric and asymmetric superconducting loops
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DOI：
10.1103/physrevb.80.144501
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发表时间：
2009-10
影响因子：
3.7
通讯作者：
Guo-Qiao Zha;M. Milošević;Shiping Zhou;F. Peeters
中科院分区：
文献类型：
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作者：
Guo-Qiao Zha;M. Milošević;Shiping Zhou;F. Peeters
通过数值求解Bogoliubov-de Gennes方程，自洽地研究了介观d波对称和非对称超导回路中能量和超电流的磁通量依赖性.对于正方形环，我们发现在能量和超导电流的hc /e-磁通周期性，并证明磁通周期性是敏感的空穴大小和超导配对强度以及温度。当我们将中心孔充分移出样品中心时，hc /2 e周期行为几乎可以完全恢复。在矩形回路中，对于序参量为奇数的绕组数，可以存在离散载流低能谱。
The magnetic flux dependence of energy and supercurrent in mesoscopic d-wave symmetric and asymmetric superconducting loops is investigated by numerically solving the Bogoliubov-de Gennes equations selfconsistently. For square loops, we find an hc /e-flux periodicity in energy and supercurrent and demonstrate that the flux periodicity is sensitive to the hole size and the superconducting pairing strength as well as temperature. The hc /2e-periodic behavior can be restored almost entirely when we displace the central hole sufficiently out of the center of the sample. In rectangular loops, the discrete current-carrying low-energy spectrum can exist for an odd winding number of the order parameter.