نتایج جستجو برای: Two-orbital Quantum dot

تعداد نتایج: 2703383  

Journal: :journal of sciences islamic republic of iran 0
a. eskandari-asl department of physics, faculty of sciences, university of shahid beheshti, tehran, islamic republic of iran

the one photon absorption (opa) cross section of a current carrying two-orbital quantum dot (qd) with strong electron-phonon interaction (polaron regime) is considered. using the self-consistent non-equilibrium hartree-fock (hf) approximation, we determine the dependence of opa cross section on the applied bias voltage, the strength of effective electron-electron interaction, and level spacing ...

Journal: :The Journal of chemical physics 2006
W B Jian Weigang Lu Jiye Fang S J Chiang M D Lan C Y Wu Z Y Wu F R Chen J J Kai

Different sizes of three-dimensional PbSe quantum dots have been synthesized for the study of orbital magnetic susceptibilities. Two types of orbital susceptibilities have been found, including the Curie susceptibility and finite-size corrections to the Landau susceptibility. The Curie term of a quantum dot manifests itself in the temperature dependence of magnetic susceptibility at low tempera...

2007
D. Sztenkiel R. Świrkowicz

Electron transport across two capacitively coupled quantum dots in a parallel geometry is theoretically studied in the non-linear response regime with spin and orbital degrees of freedom taken into account and the Kondo effect induced by on-site and inter-dot Coulomb correlations is analyzed. For a system with each dot symmetrically coupled to a separate set of electrodes a well-defined spin an...

Journal: :Physical review letters 2014
J van Bree A Yu Silov P M Koenraad M E Flatté

Circulating orbital currents produced by the spin-orbit interaction for a single electron spin in a quantum dot are explicitly evaluated at zero magnetic field, along with their effect on the total magnetic moment (spin and orbital) of the electron spin. The currents are dominated by coherent superpositions of the conduction and valence envelope functions of the electronic state, are smoothly v...

2014
J. van Bree

Circulating orbital currents produced by the spin-orbit interaction for a single electron spin in a quantum dot are explicitly evaluated at zero magnetic field, along with their effect on the total magnetic moment (spin and orbital) of the electron spin. The currents are dominated by coherent superpositions of the conduction and valence envelope functions of the electronic state, are smoothly v...

Journal: :international journal of nano dimension 0
a. daraei department of physics, faculty of science, university of sistan and baluchestan, zahedan. s. h. hajiemam department of physics, faculty of science, university of sistan and baluchestan, zahedan. a. kazempour nano research centre of payam-e noor university of yazd province, shahedieh, yazd. a. abbasi rostami department of physics, faculty of science, university of sistan and baluchestan, zahedan. m. rahimi aliabad nano research centre of payam-e noor university of yazd province, shahedieh, yazd. m. shokohi department of physics, faculty of science, university of sistan and baluchestan, zahedan. s. ahmadi

in this paper, we investigate variation of the wavelength, intensity and polarization of the self-assembled inas/gaas quantum dots emission by microphotoluminescence spectroscopy at the liquid helium temperature. the microcavity wafer sample is grown by molecular beam epitaxy (mbe) and chemically etched into the micropillar structure (with elliptical cross section - long and short axis 2µm×1.5µ...

آرش فیروزنیا, , سعیده رمضانی ثانی, , عبدالله مرتضی علی, , محمدرضا سرکرده‌ای, ,

In this paper we study the integer quantum Hall effect (IQHE) on the systems with different types of impurities in delta and gaussian forms. The Landau energy levels in the presence of impurity split in two different levels,the extended and localized levels, emerging then the Hall step. Finally, we add a specified form of a quantum dot potential to a system with impurity, and observed that incr...

2006
T. KITA

We study the three-orbital Kondo effect in quantum dot (QD) systems by applying the non-crossing approximation to the three-orbital Anderson impurity model. By investigating the tunneling conductance through a QD, we show that the competition between the Hund-coupling and the orbital level-splitting gives rise to characteristic behavior in transport properties. It is found that the Hund-couplin...

A. Abbasi Rostami A. Daraei, A. Kazempour M. Rahimi Aliabad M. Shokohi S. Ahmadi S. H. Hajiemam

In this paper, we investigate variation of the wavelength, intensity and polarization of the self-assembled InAs/GaAs quantum dots emission by microphotoluminescence spectroscopy at the liquid helium temperature. The microcavity wafer sample is grown by molecular beam epitaxy (MBE) and chemically etched into the micropillar structure (with elliptical cross section - long and short axis 2µm×1.5µ...

2000
Teemu Pohjola Herbert Schoeller Gerd Schön

– Motivated by recent experiments, in which the Kondo effect has been observed for the first time in a double quantum-dot structure, we study electron transport through a system consisting of two ultrasmall, capacitively-coupled dots with large level spacing and charging energy. Due to strong interdot Coulomb correlations, the Kondo effect has two possible sources, the spin and orbital degenera...

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