Theory of tunneling conductance of graphene normal metal-insulator-superconductor junctions

Subhro Bhattacharjee; Moitri Maiti; K. Sengupta

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Theory of tunneling conductance of graphene normal metal-insulator-superconductor junctions

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We calculate the tunneling conductance of a graphene normal metal-insulator-superconductor (NIS) junction with a barrier of thickness d and with an arbitrary voltage V_0 applied across the barrier region. We demonstrate that the tunneling conductance of such a NIS junction is an oscillatory function of both d and V_0. We also show that the periodicity and amplitude of such oscillations deviate from their universal values in the thin barrier limit as obtained in an earlier work S. Bhattacharjee and K. Sengupta, Phys. Rev. Lett. 97, 217001 (2006) and become a function of the applied voltage V_0. Our results reproduce the earlier results on tunneling conductance of such junctions in the thin S. Bhattacharjee and K. Sengupta, Phys. Rev. Lett. 97, 217001 (2006) and zero C. W. J. Beenakker, Phys. Rev. Lett. 97, 067007 (2006) barrier limits as special limiting cases. We discuss the experimental relevance of our results.

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《Physical review, B. Condensed matter and materials physics》 |2007年第18期|184514.1-184514.7|共9页
作者
Subhro Bhattacharjee; Moitri Maiti; K. Sengupta;
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作者单位

CCMT, Department of Physics, Indian Institute of Science, Bangalore 560012, India;

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正文语种英语
中图分类固体物理学;
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proximity effects; Andreev effect; SN and SNS junctions; mesoscopic and nanoscale systems;

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2. Resonant tunneling in normal metal-superconductor junctions: Low-voltage conductance features and excess current [J] . V.A.Khlus, A.V.Dyomin Journal of Superconductivity . 1995,第1期

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3. High-transparency superconductor-insulator-normal- metal-insulator-superconductor Josephson junctions for digital electronics [J] . Nevirkovets IP., Ketterson JB. Applied physics letters . 2002,第7期

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5. Klein Tunneling and Berry Phase $\pi$ in Bilayer Graphene with a Band Gap [O] . Park, Sunghun, Sim, H. -S. 2011

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Theory of tunneling conductance of graphene normal metal-insulator-superconductor junctions

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