Giant Andreev backscattering through a quantum point contact coupled via a disordered two-dimensional electron gas to superconductors

被引：20

作者：

denHartog, SG

vanWees, BJ

Nazarov, YV

Klapwijk, TM

Borghs, G

机构：

[1] UNIV GRONINGEN,CTR MAT SCI,NL-9747 AG GRONINGEN,NETHERLANDS

[2] DELFT UNIV TECHNOL,FAC APPL PHYS,NL-2628 CJ DELFT,NETHERLANDS

[3] DELFT UNIV TECHNOL,DELFT INST MICROELECT & SUBMICRON TECHNOL,NL-2628 CJ DELFT,NETHERLANDS

[4] INTERUNIV MICROELECT CTR,B-3030 LOUVAIN,BELGIUM

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.79.3250

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the superconducting-phase-modulated reduction in the resistance of a ballistic quantum point contact (QPC) connected via a disordered two-dimensional electron gas (2DEG) to superconductors. We show that this reduction is caused by coherent Andreev backscattering of holes through the QPC, which increases monotonically by reducing the bias voltage to zero. In contrast, the magnitude of the phase-dependent resistance of the disordered 2DEG displays a nonmonotonic reentrant behavior versus bias voltage.

引用

页码：3250 / 3253

页数：4