Proximity effect and multiple Andreev reactions in few-layer graphene

被引：86

作者：

Shailos, A.

Nativel, W.

Kasumov, A.

Collet, C.

Ferrier, M.

Gueron, S.

Deblock, R.

Bouchiat, H. ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, UMR 8502, F-91405 Orsay, France

[2] Thales Res & Technol, F-91767 Palaiseau, France

来源：

EPL | 2007年 / 79卷 / 05期

关键词：

D O I：

10.1209/0295-5075/79/57008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated electronic transport of few- layer graphene ( FLG) connected to superconducting electrodes. The device is prepared by mechanical exfoliation of graphite. A small mesa of FLG is connected to two tungsten electrodes, separated by 2.5 mu m, grown by focused ion beam. Whereas the tungsten electrodes are superconducting below 4 K, the proximity effect in FLG develops below 1 K, and is characterized by a factor 2 differential resistance drop at low bias. We find multiple Andreev reflection peaks at voltages corresponding to submultiples of 2 Delta/ e ( with. the superconducting gap of the electrodes), which persist up to fields of a few tesla.

引用

页数：5

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