Full electrostatic control of quantum interference in an extended trenched Josephson junction

被引：17

作者：

Guiducci, Stefano ^{[1
,2
]}

Carrega, Matteo ^{[1
,2
]}

Taddei, Fabio ^{[1
,2
]}

Biasiol, Giorgio ^{[3
]}

Courtois, Herve ^{[4
]}

Beltram, Fabio ^{[1
,2
]}

Heun, Stefan ^{[1
,2
]}

机构：

[1] CNR, Ist Nanosci, NEST, Piazza San Silvestro 12, I-56127 Pisa, Italy

[2] Scuola Normale Super Pisa, Piazza San Silvestro 12, I-56127 Pisa, Italy

[3] IOM CNR, Lab TASC, Area Sci Pk, I-34149 Trieste, Italy

[4] Univ Grenoble Alpes, CNRS, Inst Neel, 25 Ave Martyrs, Grenoble, France

来源：

PHYSICAL REVIEW B | 2019年 / 99卷 / 23期

基金：

欧洲研究理事会;

关键词：

ENERGY-GAP STRUCTURE; MAJORANA FERMIONS; TRANSPORT; ACCUMULATION; QUANTIZATION; OSCILLATIONS; CURRENTS; STATES; FIELD;

D O I：

10.1103/PhysRevB.99.235419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hybrid semiconductor/superconductor devices constitute an important platform for a wide range of applications, from quantum computing to topological-state-based architectures. Here, we demonstrate full modulation of the interference pattern in a superconducting interference device with two parallel islands of ballistic InAs quantum wells separated by a trench, by acting independently on two side gates. This so far unexplored geometry enables us to tune the device with high precision from a SQUID-like to a Fraunhofer-type behavior simply by electrostatic gating, without the need for an additional in-plane magnetic field. These measurements are successfully analyzed within a theoretical model of an extended tunnel Josephson junction, taking into account the focusing factor of the setup. The impact of these results on the design of novel devices is discussed.

引用

页数：9

共 57 条

[1] Exponential protection of zero modes in Majorana islands [J].

Albrecht, S. M. ;

Higginbotham, A. P. ;

Madsen, M. ;

Kuemmeth, F. ;

Jespersen, T. S. ;

Nygard, J. ;

Krogstrup, P. ;

Marcus, C. M. .

NATURE, 2016, 531 (7593) :206-+

[2] A ballistic two-dimensional-electron-gas Andreev interferometer [J].

Amado, M. ;

Fornieri, A. ;

Biasiol, G. ;

Sorba, L. ;

Giazotto, F. .

APPLIED PHYSICS LETTERS, 2014, 104 (24)

[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]

Ashcroft N.W., 1976, SOLID STATE PHYS

[5] JOSEPHSON CURRENT FLOW IN PURE SUPERCONDUCTING-NORMAL-SUPERCONDUCTING JUNCTIONS [J].

BARDEEN, J ;

JOHNSON, JL .

PHYSICAL REVIEW B, 1972, 5 (01) :72-&

[6]

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

[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] Quasiclassical Green's function approach to mesoscopic superconductivity [J].

Belzig, W ;

Wilhelm, FK ;

Bruder, C ;

Schön, G ;

Zaikin, AD .

SUPERLATTICES AND MICROSTRUCTURES, 1999, 25 (5-6) :1251-1288

[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

← 1 2 3 4 5 6 →