A ballistic quantum ring Josephson interferometer

被引：13

作者：

Fornieri, A. ^{[1
,2
]}

Amado, M. ^{[1
,2
]}

Carillo, F. ^{[1
,2
]}

Dolcini, F. ^{[3
,5
]}

Biasiol, G. ^{[4
]}

Sorba, L. ^{[1
,2
]}

Pellegrini, V. ^{[1
,2
]}

Giazotto, F. ^{[1
,2
]}

机构：

[1] CNR, Ist Nanosci, NEST, I-56127 Pisa, Italy

[2] Scuola Normale Super Pisa, I-56127 Pisa, Italy

[3] Politecn Torino, Dipartimento Sci Applicata & Tecnol, I-10129 Turin, Italy

[4] CNR, IOM, Lab TASC, I-34149 Trieste, Italy

[5] CNR, SPIN, I-80126 Naples, Italy

来源：

NANOTECHNOLOGY | 2013年 / 24卷 / 24期

关键词：

MAJORANA FERMIONS; SUPERCONDUCTOR; SUPERCURRENT; NANOWIRE;

D O I：

10.1088/0957-4484/24/24/245201

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the realization of a ballistic Josephson interferometer. The interferometer is made from a quantum ring etched in a nanofabricated two-dimensional electron gas confined in an InAs-based heterostructure laterally contacted to superconducting niobium leads. The Josephson current flowing through the structure shows oscillations with h/e flux periodicity when threading the loop with a perpendicular magnetic field. This periodicity, in sharp contrast with the h/2e one observed in conventional dc superconducting quantum interference devices, confirms the ballistic nature of the device in agreement with theoretical predictions. This system paves the way for the implementation of interferometric Josephson pi-junctions, and for the investigation of Majorana fermions.

引用

页数：6

共 40 条

[1] SIGNIFICANCE OF ELECTROMAGNETIC POTENTIALS IN THE QUANTUM THEORY [J].

AHARONOV, Y ;

BOHM, D .

PHYSICAL REVIEW, 1959, 115 (03) :485-491

[2] New directions in the pursuit of Majorana fermions in solid state systems [J].

Alicea, Jason .

REPORTS ON PROGRESS IN PHYSICS, 2012, 75 (07)

[3] Electrostatic tailoring of magnetic interference in quantum point contact ballistic Josephson junctions [J].

Amado, M. ;

Fornieri, A. ;

Carillo, F. ;

Biasiol, G. ;

Sorba, L. ;

Pellegrini, V. ;

Giazotto, F. .

PHYSICAL REVIEW B, 2013, 87 (13)

[4] Reversing the direction of the supercurrent in a controllable Josephson junction [J].

Baselmans, JJA ;

Morpurgo, AF ;

van Wees, BJ ;

Klapwijk, TM .

NATURE, 1999, 397 (6714) :43-45

[5] Quasiparticle interference effects in a ballistic superconductor-semiconductor-superconductor Josephson junction [J].

Bastian, G ;

Gobel, EO ;

Zorin, AB ;

Schulze, H ;

Niemeyer, J ;

Weimann, T ;

Bennett, MR ;

Singer, KE .

PHYSICAL REVIEW LETTERS, 1998, 81 (08) :1686-1689

[6] Correlated quantization of supercurrent and conductance in a superconducting quantum point contact -: art. no. 174502 [J].

Bauch, T ;

Hürfeld, E ;

Krasnov, VM ;

Delsing, P ;

Takayanagi, H ;

Akazaki, T .

PHYSICAL REVIEW B, 2005, 71 (17)

[7] Search for Majorana Fermions in Superconductors [J].

Beenakker, C. W. J. .

ANNUAL REVIEW OF CONDENSED MATTER PHYSICS, VOL 4, 2013, 4 :113-136

[8] JOSEPHSON CURRENT THROUGH A SUPERCONDUCTING QUANTUM POINT CONTACT SHORTER THAN THE COHERENCE LENGTH [J].

BEENAKKER, CWJ ;

VANHOUTEN, H .

PHYSICAL REVIEW LETTERS, 1991, 66 (23) :3056-3059

[9] TRANSITION FROM METALLIC TO TUNNELING REGIMES IN SUPERCONDUCTING MICRO-CONSTRICTIONS - EXCESS CURRENT, CHARGE IMBALANCE, AND SUPER-CURRENT CONVERSION [J].

BLONDER, GE ;

TINKHAM, M ;

KLAPWIJK, TM .

PHYSICAL REVIEW B, 1982, 25 (07) :4515-4532

[10] Scattering mechanisms in undoped In0.75Ga0.25As/In0.75Al0.25/As two-dimensional electron gases [J].

Capotondi, F ;

Blasiol, G ;

Ercolani, D ;

Sorba, L .

JOURNAL OF CRYSTAL GROWTH, 2005, 278 (1-4) :538-543

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