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arXiv 1005.2630cond-mat.supr-concond-mat.mes-hall
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石墨烯约瑟夫森结的电流-相位关系

Current-phase relation of graphene Josephson junctions

C. Chialvo, I. C. Moraru, D. J. Van Harlingen, N. Mason

摘要:

约瑟夫森结的电流-相位关系揭示了影响超电流的微观过程和对称性的重要信息。在这封信中,我们提出了直接测量的CPR的约瑟夫森结与石墨烯的障碍,获得了相位敏感的SQUID干涉技术。我们发现,CPR是歪斜的,相对于通常观察到的正弦曲线的行为。偏斜度的量随临界电流(Ic)线性变化,而不管Ic是否由载流子密度或温度调谐。

英文摘要:

The current-phase relation (CPR) of a Josephson junction reveals valuable information about the microscopic processes and symmetries that influence the supercurrent. In this Letter, we present direct measurements of the CPR for Josephson junctions with a graphene barrier, obtained by a phase-sensitive SQUID interferometry technique. We find that the CPR is skewed with respect to the commonly observed sinusoidal behavior. The amount of skewness varies linearly with critical current (Ic) regardless of whether Ic is tuned by the carrier density or temperature.

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