Magnetic flux periodicity in mesoscopic d-wave symmetric and asymmetric superconducting loops
Guo-Qiao Zha, M. V. Milošević, Shi-Ping Zhou, F. M. Peeters
DOI 10.1103/PhysRevB.80.144501 · Physical Review B
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Abstract
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 self-consistently. 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.
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