scholarly journals Kondo effect on adiabatic spin pumping from a quantum dot driven by a rotating magnetic field

2008 ◽  
Vol 78 (15) ◽  
Author(s):  
Kiminori Hattori
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Kondo Effect ◽  
Rotating Magnetic Field ◽  
Spin Pumping

scholarly journals Kondo Effect in Carbon Nanotube Quantum Dot in a Magnetic Field

2009 ◽  
Vol 115 (10) ◽  
pp. 293-295
Author(s):  
D. Krychowski ◽  
S. Lipiński
Keyword(s):  
Magnetic Field ◽  
Carbon Nanotube ◽  
Quantum Dot ◽  
Kondo Effect

Pumping Currents from Applying a Microwave Field and a Magnetic Field to a Quantum Dot

2011 ◽  
Vol 181-182 ◽  
pp. 993-997
Author(s):  
Yun Qing Zhou ◽  
Jian Ming Yao ◽  
Ling Min Kong ◽  
Rui Wang
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Bias Voltage ◽  
Microwave Field ◽  
Evolution Operator ◽  
Operator Approach ◽  
Zero Bias ◽  
Spin Pumping

The evolution operator approach is applied to studying photon-electron pumping effects on a quantum dot connected to two magnetic leads in the presence of both via-dot and over-dot tunneling channels. It is found that a microwave field applied to the quantum dot may give rise to charge and spin pumping at zero bias voltage for asymmetric magnetic junctions.

scholarly journals Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field

2020 ◽  
Vol 11 ◽  
pp. 225-239
Author(s):  
Levente Máthé ◽  
Ioan Grosu
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Quantum Dot ◽  
Coulomb Interaction ◽  
Coulomb Blockade ◽  
Kondo Effect ◽  
Dirac Point ◽  
Analytical Formula ◽  
Kondo Temperature ◽  
Hole Doping

Background: Quantum dots connected to larger systems containing a continuum of states like charge reservoirs allow the theoretical study of many-body effects such as the Coulomb blockade and the Kondo effect. Results: Here, we analyze the nonequilibrium Kondo effect and transport phenomena in a quantum dot coupled to pure monolayer graphene electrodes under external magnetic fields for finite on-site Coulomb interaction. The system is described by the pseudogap Anderson Hamiltonian. We use the equation of motion technique to determine the retarded Green’s function of the quantum dot. An analytical formula for the Kondo temperature is derived for electron and hole doping of the graphene leads. The Kondo temperature vanishes in the vicinity of the particle–hole symmetry point and at the Dirac point. In the case of particle–hole asymmetry, the Kondo temperature has a finite value even at the Dirac point. The influence of the on-site Coulomb interaction and the magnetic field on the transport properties of the system shows a tendency similar to the previous results obtained for quantum dots connected to metallic electrodes. Most remarkably, we find that the Kondo resonance does not show up in the density of states and in the differential conductance for zero chemical potential due to the linear energy dispersion of graphene. An analytical method to calculate self-energies is also developed which can be useful in the study of graphene-based systems. Conclusion: Our graphene-based quantum dot system provides a platform for potential applications of nanoelectronics. Furthermore, we also propose an experimental setup for performing measurements in order to verify our model.

scholarly journals Out-of-equilibrium Kondo effect in a quantum dot: Interplay of magnetic field and spin accumulation

2016 ◽  
Vol 116 (5) ◽  
pp. 57005 ◽  
Author(s):  
Shaon Sahoo ◽  
Adeline Crépieux ◽  
Mireille Lavagna
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Kondo Effect ◽  
Spin Accumulation

scholarly journals Kondo effect in a one-electron double quantum dot: Oscillations of the Kondo current in a weak magnetic field

2006 ◽  
Vol 74 (23) ◽  
Author(s):  
D. M. Schröer ◽  
A. K. Hüttel ◽  
K. Eberl ◽  
S. Ludwig ◽  
M. N. Kiselev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Weak Magnetic Field ◽  
Kondo Effect ◽  
Double Quantum ◽  
Double Quantum Dot

scholarly journals Two-Stage Kondo Effect in a Quantum Dot at a High Magnetic Field

2002 ◽  
Vol 88 (12) ◽  
Author(s):  
W. G. van der Wiel ◽  
S. De Franceschi ◽  
J. M. Elzerman ◽  
S. Tarucha ◽  
L. P. Kouwenhoven ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
High Magnetic Field ◽  
Kondo Effect ◽  
Two Stage

Spin-half Kondo effect in a single self-assembled InAs quantum dot with and without an applied magnetic field

2007 ◽  
Vol 76 (8) ◽  
Author(s):  
Y. Igarashi ◽  
M. Jung ◽  
M. Yamamoto ◽  
A. Oiwa ◽  
T. Machida ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Applied Magnetic Field ◽  
Kondo Effect ◽  
Self Assembled ◽  
Inas Quantum Dot
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