نتایج جستجو برای: Modified Gaussian Quantum Dot

تعداد نتایج: 623448  

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...

In this paper, the effect of pressure, temperature and impurity on the energylevels, binding energy, linear and nonlinear optical properties of a modified Gaussianquantum dot are studied. In this regard, the finite element method is employed to solvethe single electron Schrodinger equation in the effective mass approximation with andwithout impurity at the center of the dot. In addition, the en...

2001
Nammee Kim G. Ihm H.-S. Sim T. W. Kang

The electronic properties of a modified magnetic quantum dot are studied. The modified magnetic quantum dot is a quantum structure that is formed by spatially inhomogeneous distributions of magnetic fields. Electrons are magnetically confined to the plane where the magnetic fields inside and outside the dot are different from each other. The energy spectrum exhibits quite different features dep...

B. Arzhang, H. Noshad, H. Tajalli, M. Sahrai,

The time evolution of the quantum entropy in a coherently driven threelevel quantum dot (QD) molecule is investigated. The entanglement of quantum dot molecule and its spontaneous emission field is coherently controlled by the gat voltage and the intensity of applied field. It is shown that the degree of entanglement between a three-level quantum dot molecule and its spontaneous emission fields...

Journal: :international journal of nano dimension 0
m. abdollahi department of physics, faculty of science, i.h.u tehran, iran. m. a. talebian darzi department of physics, faculty of science, i.h.u tehran, iran. h. hoseinkhani department of physics, faculty of science, i.h.u tehran, iran. h. baghbani rizi department of physics, faculty of science, i.h.u tehran, iran.

in this research, the effect of the first order magnetic field on the ground-state of a centered hydrogenic donor impurity in a gaas/alas spherical quantum dot has been calculated. the perturbation method has been used within the framework of effective mass approximation for these calculations. overall, the analysis shows that a proper choice of quantum dot radius and magnetic field can signifi...

Journal: :international journal of nano dimension 0
a. azari islamic azad university, tabriz branch, tabriz, iran. s. zabihi a. islamic azad university, tabriz branch, tabriz, iran. k. seyyedi.s islamic azad university, tabriz branch, tabriz, iran.

a noninteracting quantum-dot arrays side coupled to a quantum wire is studied. transport through the quantum wire is investigated by using a noninteracting anderson tunneling hamiltonian. the conductance at zero temperature develops an oscillating band with resonances and antiresonances due to constructive and destructive interference in the ballistic channel, respectively. moreover, we have fo...

Journal: :Superlattices and Microstructures 2008

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...

A. Azari, K. Seyyedi.S S. Zabihi A.,

A noninteracting quantum-dot arrays side coupled to a quantum wire is studied. Transport through the quantum wire is investigated by using a noninteracting Anderson tunneling Hamiltonian. The conductance at zero temperature develops an oscillating band with resonances and antiresonances due to constructive and destructive interference in the ballistic channel, respectively. Moreover, we have fo...

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...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید