Tunnelling resonances and Andreev reflection in transport of electrons through a normal-metal-quantum-dot-superconductor system

Using the equivalent single-particle multi-channel network and the Landauer formula, we theoretically study anti-resonances in conductance of a normal metal–superconductor junction with a side-coupled quantum dot. The transport properties depend on the interplay between the Coulomb blockade effect and the Andreev reflection. It is found that the calculated dependence of the conductance on the gate voltage of dot exhibits two anti-resonant conductance dips. This behavior is caused by the destructive interference of the wave directly transmitted through the normal metal–superconductor junction and the wave reflected from the dot. Moreover, we find that the shape of two anti-resonance profile is symmetric, due to the Andreev reflection, depending on the strength of coupling between the quantum dot and normal metal.

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Coherent mesoscopic transport and Andreev reflection in a normal-metal/quantum-dot/superconducting-film/normal-metal system

Physica C Superconductivity ◽

10.1016/j.physc.2004.04.001 ◽

2004 ◽

Vol 406 (3-4) ◽

pp. 143-153 ◽

Cited By ~ 1

Author(s):

Jin-Fu Feng ◽

Shi-Jie Xiong

Keyword(s):

Quantum Dot ◽

Andreev Reflection ◽

Normal Metal ◽

Superconducting Film ◽

Metal System ◽

Mesoscopic Transport

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Effect of Intra-Dot Coulomb Interaction on Andreev Reflection in Normal-Metal/Quantum-Dot/Superconductor System

Communications in Theoretical Physics ◽

10.1088/0253-6102/36/1/101 ◽

2001 ◽

Vol 36 (1) ◽

pp. 101-108 ◽

Cited By ~ 3

Author(s):

Zhu Yu ◽

Sun Qing-Feng ◽

Lin Tsung-Han

Keyword(s):

Quantum Dot ◽

Coulomb Interaction ◽

Andreev Reflection ◽

Normal Metal

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PHOTON-ASSISTED TRANSPORT CHARACTERISTICS THROUGH QUANTUM DOT COUPLED TO SUPERCONDUCTING RESERVOIRS

NANO ◽

10.1142/s179329200600029x ◽

2006 ◽

Vol 01 (03) ◽

pp. 259-264 ◽

Cited By ~ 2

Author(s):

A. S. ATALLAH ◽

A. H. PHILLIPS ◽

A. F. AMIN ◽

M. A. SEMARY

Keyword(s):

Magnetic Field ◽

Numerical Calculation ◽

Quantum Dot ◽

Resonant Tunneling ◽

Andreev Reflection ◽

Point Contact ◽

Quantum Point Contact ◽

Time Varying ◽

Quantum Point ◽

Tunneling Behavior

The influence of time-varying fields on the transport through a mesoscopic device has been investigated. This mesoscopic device is modeled as a quantum dot coupled to superconducting reservoirs via quantum point contact. The effect of a magnetic field and the Andreev reflection process were taken into account. The conductance was deduced by using Landuaer–Buttiker equation. A numerical calculation has been performed that shows a resonant tunneling behavior. Such investigation is important for fabricating photoelectron mesoscopic devices.

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