scholarly journals Electronic Transport through a Quantum Dot Coupled to Non-Collinear Ferromagnetic Electrodes: The Kondo Regime

2008 ◽  
Vol 113 (1) ◽  
pp. 565-568
Author(s):  
R. Świrkowicz ◽  
M. Wilczyński ◽  
M. Wawrzyniak ◽  
J. Barnaś
Keyword(s):  
Quantum Dot ◽  
Electronic Transport ◽  
Ferromagnetic Electrodes

LINEAR CONDUCTANCE AND TUNNEL MAGNETORESISTANCE IN A RASHBA QUANTUM DOT RING COUPLED TO FERROMAGNETIC LEADS

2011 ◽  
Vol 25 (03) ◽  
pp. 193-201
Author(s):  
FENG CHI ◽  
LING HUANG ◽  
JIA ZHAO
Keyword(s):  
Quantum Dot ◽  
Electronic Transport ◽  
Function Theory ◽  
Peak Position ◽  
Orbit Interaction ◽  
Quantum Ring ◽  
Tunnel Magnetoresistance ◽  
Ferromagnetic Electrodes ◽  
Rashba Spin ◽  
Linear Conductance

Spin-dependent electronic transport through a quantum ring with a quantum dot (QD) inserted in one of its arms is investigated within the Keldysh Green's function theory. We consider that the ring is connected to external ferromagnetic electrodes and there is Rashba spin-orbit interaction (SOI) in the QD. It is found that the anomalous tunnel magnetoresistance (TMR) peak originated from the electron correlations is split into two by the direct coupling between the two leads, with the two normal Coulomb resonances unchanged. The peak position and the magnitude of the conductance and the TMR can be controlled in terms of the SOI-induced phase factor, which can be adjusted by the gate voltage or the structure parameters. The present device should be realizable within present technology and may have practical usage in spintronics.

In-plane Thermal and Electronic Transport in Quantum Dot Superlattice

2001 ◽  
Vol 677 ◽  
Author(s):  
A. Khitun ◽  
J.L. Liu ◽  
K.L. Wang ◽  
G. Chen
Keyword(s):  
Experimental Data ◽  
Thermal Properties ◽  
Quantum Dot ◽  
Electronic Transport ◽  
Lattice Thermal Conductivity ◽  
Phonon Transport ◽  
Host Materials ◽  
Simulation Results ◽  
Germanium Quantum Dots ◽  
Good Agreement

ABSTRACTWe present a theoretical model in order to describe both thermal and electronic in-plane transports in quantum dot superlattice. The model takes into account the modifications of electron and phonon transport due to the space confinement caused by the mismatch in electronic and thermal properties between dot and host materials. The developed model provides the analysis of the in-plane superlattice electronic and thermal properties versus quantum dot size and their arrangement. Numerical calculations were carried out for a structure that consists of multiple layers of Si with regimented germanium quantum dots. The simulation results of the lattice thermal conductivity are in a good agreement with experimental data.

Electronic transport through a T-shaped four-quantum dot system

2007 ◽  
Vol 38 (4-5) ◽  
pp. 570-575
Author(s):  
Haitao Yin ◽  
Tianquan Lü ◽  
Hua Li ◽  
Zelong He
Keyword(s):  
Quantum Dot ◽  
Electronic Transport

scholarly journals Electronic transport through a quantum wire with a side-coupled quantum dot

2006 ◽  
Vol 36 (2a) ◽  
pp. 397-400 ◽  
Author(s):  
T. Lobo ◽  
M. S. Figueira ◽  
M. E. Foglio
Keyword(s):  
Quantum Dot ◽  
Electronic Transport ◽  
Quantum Wire

Transport Properties of Coupled Semiconductor Quantum Dots

2006 ◽  
Vol 6 (11) ◽  
pp. 3329-3332 ◽  
Author(s):  
Heejun Jeong
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Transport Properties ◽  
Electronic Transport ◽  
Low Temperatures ◽  
Spin Interaction ◽  
Many Body ◽  
Conductance Measurement ◽  
Spin Configuration ◽  
Non Linear

We have measured the electronic transport properties of the coupled quantum dot devices at low temperatures. The interplay between the strong many body spin interaction and the molecular states are probed in linear and non-linear transport regime. We observe the formation of strong coherent molecular states clearly visible in the double dot conductance phase diagram. In our study, the spin configuration in multiply coupled quantum dots could be identified using Kondo phenomenon. In addition, the characteristics of the spin dependent molecular states and phase dependant tunneling have been also observed using non-linear conductance measurement of the double dots. The results suggest the importance of the diverse spin related physical issues in artificial quantum dot devices.

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