scholarly journals Andreev reflection through a quantum dot coupled with two ferromagnets and a superconductor

2001 ◽  
Vol 65 (2) ◽  
Author(s):  
Yu Zhu ◽  
Qing-feng Sun ◽  
Tsung-han Lin
Keyword(s):  
Quantum Dot ◽  
Andreev Reflection

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

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 259-264 ◽  
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.

Andreev reflection in a triple quantum dot system coupled with a normal-metal and a superconductor

2009 ◽  
Vol 247 (2) ◽  
pp. 335-341 ◽  
Author(s):  
Long Bai ◽  
Yang-Jin Wu ◽  
Baigeng Wang
Keyword(s):  
Quantum Dot ◽  
Andreev Reflection ◽  
Normal Metal

scholarly journals Enhanced Negative Nonlocal Conductance in an Interacting Quantum Dot Connected to Two Ferromagnetic Leads and One Superconducting Lead

Entropy ◽  
2019 ◽  
Vol 21 (10) ◽  
pp. 1003 ◽  
Author(s):  
Cong Lee ◽  
Bing Dong ◽  
Xiao-Lin Lei
Keyword(s):  
Quantum Dot ◽  
Spin Polarization ◽  
Electronic Transport ◽  
Andreev Reflection ◽  
Mean Field ◽  
Function Technique ◽  
Field Approach ◽  
Tunnel Coupling ◽  
Nonequilibrium Green Function ◽  
Parallel Configuration

In this paper, we investigate the electronic transport properties of a quantum dot (QD) connected to two ferromagnetic leads and one superconducting lead in the Kondo regime by means of the finite-U slave boson mean field approach and the nonequilibrium Green function technique. In this three-terminal hybrid nanodevice, we focus our attention on the joint effects of the Kondo correlation, superconducting proximity pairing, and spin polarization of leads. It is found that the superconducting proximity effect will suppress the linear local conductance (LLC) stemming from the weakened Kondo peak, and when its coupling Γ s is bigger than the tunnel-coupling Γ of two normal leads, the linear cross conductance (LCC) becomes negative in the Kondo region. Regarding the antiparallel configuration, increasing spin polarization further suppresses LLC but enhances LCC, i.e., causing larger negative values of LCC, since it is beneficial for the emergence of cross Andreev reflection. On the contrary, for the parallel configuration, with increasing spin polarization, the LLC decreases and greatly widens with the appearance of shoulders, and eventually splits into four peaks, while the LCC decreases relatively rapidly to the normal conductance.

scholarly journals Resonant Andreev reflection in a normal-metal–quantum-dot–superconductor system

1999 ◽  
Vol 59 (5) ◽  
pp. 3831-3840 ◽  
Author(s):  
Qing-feng Sun ◽  
Jian Wang ◽  
Tsung-han Lin
Keyword(s):  
Quantum Dot ◽  
Andreev Reflection ◽  
Normal Metal

Andreev reflection in a quantum dot coupled to ferromagnetic and superconductor leads under magnetic fields

2008 ◽  
Vol 372 (11) ◽  
pp. 1930-1936 ◽  
Author(s):  
Yu-Shen Liu ◽  
Xi-Feng Yang ◽  
Xi-Hui Fan ◽  
Yun-Jie Xia
Keyword(s):  
Magnetic Fields ◽  
Quantum Dot ◽  
Andreev Reflection
Sign in / Sign up

Export Citation Format

Share Document