Induced superconductivity in graphene

被引：60

作者：

Heersche, Hubert B. ^{[1
]}

Jarillo-Herrero, Pablo ^{[1
]}

Oostinga, Jeroen B. ^{[1
]}

Vandersypen, Lieven M. K. ^{[1
]}

Morpurgo, Alberto F. ^{[1
]}

机构：

[1] Delft Univ Technol, Kavli Inst Nanosci, POB 5046, NL-2600 GA Delft, Netherlands

来源：

SOLID STATE COMMUNICATIONS | 2007年 / 143卷 / 1-2期

关键词：

graphene; Josephson effect; superconductivity;

D O I：

10.1016/j.ssc.2007.02.044

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Graphene layers, prepared by mechanical exfoliation, were contacted by superconducting electrodes consisting of a titanium-aluminium bilayer. Quantum hall measurements in the normal state confirmed the single layer nature of the graphene samples. Proximity induced supercurrents were observed in all samples, below 1 K. Using a backgate, the Fermi energy could be swept from valence to conduction band via the Charge neutrality point, demonstrating supercurrents carried by holes and electrons, respectively. Interestingly, a finite supercurrent was also observed at the charge neutrality (or Dirac) point, where the density of carrier states vanishes. Our results demonstrate phase coherence in graphene. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：72 / 76

页数：5

共 19 条

[1]

Barone A., 1982, Physics and applications of the Josephson effect

[2]

CUEVAS JC, 2006, PHYS REV B, V74

[3]

Datta S., 1997, Electronic Transport in Mesoscopic Systems

[4]

Dresselhaus MS, 1996, Science of fullerenes and carbon nanotubes: Their properties and applications

[5] Unconventional integer quantum Hall effect in graphene [J].

Gusynin, VP ;

Sharapov, SG .

PHYSICAL REVIEW LETTERS, 2005, 95 (14)

[6] Bipolar supercurrent in graphene [J].

Heersche, Hubert B. ;

Jarillo-Herrero, Pablo ;

Oostinga, Jeroen B. ;

Vandersypen, Lieven M. K. ;

Morpurgo, Alberto F. .

NATURE, 2007, 446 (7131) :56-59

[7] Quantum supercurrent transistors in carbon nanotubes [J].

Jarillo-Herrero, P ;

van Dam, JA ;

Kouwenhoven, LP .

NATURE, 2006, 439 (7079) :953-956

[8] OBSERVATION OF PARITY-INDUCED SUPPRESSION OF JOSEPHSON TUNNELING IN THE SUPERCONDUCTING SINGLE-ELECTRON TRANSISTOR [J].

JOYEZ, P ;

LAFARGE, P ;

FILIPE, A ;

ESTEVE, D ;

DEVORET, MH .

PHYSICAL REVIEW LETTERS, 1994, 72 (15) :2458-2461

[9] SUPERCONDUCTING WEAK LINKS [J].

LIKHAREV, KK .

REVIEWS OF MODERN PHYSICS, 1979, 51 (01) :101-159

[10] Strong suppression of weak localization in graphene [J].

Morozov, S. V. ;

Novoselov, K. S. ;

Katsnelson, M. I. ;

Schedin, F. ;

Ponomarenko, L. A. ;

Jiang, D. ;

Geim, A. K. .

PHYSICAL REVIEW LETTERS, 2006, 97 (01)

← 1 2 →