Autor: Ramos, J. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Double-Donor Energy Structure in Concentric Quantum Rings under Magnetic Field and Hydrostatic Pressure
Autorzy:: Fulla, M.
Marín, J.
Londoño, D.
Duque, C.
Mora-Ramos, M.
Powiązania:: https://bibliotekanauki.pl/articles/1194836.pdf
Data publikacji:: 2014-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Eq
73.20.Hb
73.21.La
Opis:: A model for an artificial hydrogen molecule consisting of two positive on-axis Coulombic centers and two electrons coupled to them inside a double concentric quantum ring is considered. Such a nanostructure is assumed to be under the influence of external probes like hydrostatic pressure and magnetic field. By using the adiabatic approximation, the ground state energy is calculated as a function of the outer center line radius and the impurity Coulombic center separation, for different values of the hydrostatic pressure and magnetic field strength. In contrast to the single properties imposed by nature on the actual hydrogen molecule, our model allows us to explore a great variety of properties of the artificial hydrogen molecule by changing the ring dimensions. The artificial hydrogen molecule energy structure may be tuned by changing the external field strengths.
Źródło:: Acta Physica Polonica A; 2014, 125, 2; 220-223
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: $D_2^+$ Molecular Complex in Ring-Like Nanostructures: Hydrostatic Pressure and Electromagnetic Field Effects
Autorzy:: Fulla, M.
Marín, J.
Gutiérrez, W.
Duque, C.
Mora-Ramos, M.
Powiązania:: https://bibliotekanauki.pl/articles/1215648.pdf
Data publikacji:: 2014-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.55.Eq
73.20.Hb
73.21.La
Opis:: In this work we investigate the energy states in a $D_2^+$ complex formed by the coupling of a conduction band electron and two donor centers in a quantum ring with rectangular cross-section. The influences of externally applied probes like electric and magnetic fields and hydrostatic pressure together with the change in the relative position between the two Coulombic centers are particularly studied, highlighting the important contribution of the repulsive inter-center interaction. The destruction of the Aharonov-Bohm oscillations of the ground state associated with the localization of the electron states in the system is discussed.
Źródło:: Acta Physica Polonica A; 2014, 125, 2; 241-244
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Impurity-Related Nonlinear Optical Absorption in Delta-Doped Quantum Rings
Autorzy:: Restrepo, R.
Martínez-Orozco, J.
Barseghyan, M.
Mora-Ramos, M.
Duque, C.
Powiązania:: https://bibliotekanauki.pl/articles/1195152.pdf
Data publikacji:: 2014-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.65.-k
73.21.-b
78.67.-n
Opis:: Using a variational procedure within the effective mass approximation, we have calculated the hydrogenic impurity binding energy as well as the impurity-related nonlinear optical absorption in a single quantum ring with axial n-type delta-doping. The delta-like potential along the z-direction is analytically modeled with a Hartree-like confining profile fitted to a one-dimensional Thomas-Fermi-based potential in the local density approximation. Both on-center and on-edge impurity positions are considered and the energies of the impurity states are examined as functions of the vertical size of the ring. It is found that the effect of changes in the geometry of the quantum ring leads to a shifting of the resonant peaks of the intra-band optical spectrum.
Źródło:: Acta Physica Polonica A; 2014, 125, 2; 245-247
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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