scholarly journals Impact of Coulomb interaction and Kondo effect on shot noise in quantum dots

2007 ◽  
Author(s):  
A. Golub
Keyword(s):  
Quantum Dots ◽  
Coulomb Interaction ◽  
Shot Noise ◽  
Kondo Effect

Shot noise of the orbital Kondo effect in quantum dots with the particle-hole symmetry

2011 ◽  
Author(s):  
R. Sakano ◽  
T. Fujii ◽  
Jisoon Ihm ◽  
Hyeonsik Cheong
Keyword(s):  
Quantum Dots ◽  
Shot Noise ◽  
Kondo Effect

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.

Excitonic quasimolecules containing of two quantum dots

2016 ◽  
pp. 4024-4028 ◽  
Author(s):  
Sergey I. Pokutnyi ◽  
Wlodzimierz Salejda
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Exchange Interaction ◽  
Coulomb Interaction ◽  
Silicate Glass ◽  
Glass Matrix ◽  
Silicate Glass Matrix

The possibility of occurrence of the excitonic  quasimolecule formed of spatially separated electrons and holes in a nanosystem that consists  of  CuO quantum dots synthesized in a silicate glass matrix. It is shown that the major contribution to the excitonic quasimolecule binding energy is made by the energy of the exchange interaction of electrons with holes and this contribution is much more substantial than the contribution of the energy of Coulomb interaction between the electrons and holes.

Nonequilibrium Kondo effect in quantum dots

2003 ◽  
Vol 68 (19) ◽  
Author(s):  
R. Świrkowicz ◽  
J. Barnaś ◽  
M. Wilczyński
Keyword(s):  
Quantum Dots ◽  
Kondo Effect

Quantum fluctuations and the Kondo effect in small quantum dots

2000 ◽  
Vol 6 (1-4) ◽  
pp. 371-374 ◽  
Author(s):  
Jürgen König ◽  
Teemu Pohjola ◽  
Herbert Schoeller ◽  
Gerd Schön
Keyword(s):  
Quantum Dots ◽  
Kondo Effect ◽  
Quantum Fluctuations ◽  
Small Quantum

Multipeak Kondo Effect in One- and Two-Electron Quantum Dots

2006 ◽  
Vol 96 (15) ◽  
Author(s):  
A. Vidan ◽  
M. Stopa ◽  
R. M. Westervelt ◽  
M. Hanson ◽  
A. C. Gossard
Keyword(s):  
Quantum Dots ◽  
Kondo Effect ◽  
Electron Quantum

scholarly journals Kondo effect and spin filtering in coupled quantum dots

2006 ◽  
Vol 423 (1-2) ◽  
pp. 215-219 ◽  
Author(s):  
S. Lipiński ◽  
D. Krychowski
Keyword(s):  
Quantum Dots ◽  
Kondo Effect ◽  
Coupled Quantum Dots ◽  
Spin Filtering
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