scholarly journals Exchange interaction in quantum rings and wires in the Wigner-crystal limit

2005 ◽  
Vol 72 (19) ◽  
Author(s):  
Michael M. Fogler ◽  
Eugene Pivovarov
Keyword(s):  
Exchange Interaction ◽  
Wigner Crystal ◽  
Quantum Rings

Laser enhanced RKKY interaction in nanorings

2014 ◽  
Vol 28 (25) ◽  
pp. 1450174
Author(s):  
Peng Feng ◽  
Chunyu Yin
Keyword(s):  
Exchange Interaction ◽  
Quantum Communication ◽  
Three Dimensional ◽  
Unexpected Result ◽  
Magnetic Impurities ◽  
Rkky Interaction ◽  
Quantum Rings ◽  
Conduction Electrons ◽  
Indirect Exchange ◽  
Nonmagnetic Metals

The conduction electrons can deliver an indirect exchange interaction, namely RKKY interaction, between impurities dissolved in nonmagnetic metals or semiconductors by the interaction between the conduction electron spins and localized impurity spins. In two- and three-dimensional systems this interaction is very weak when the separation of impurities is large enough. However, an unexpected result exists in quantum rings. In this work we find that the laser can effectively enhance RKKY interaction in quantum rings on certain conditions, and there is a critical width of keeping this effect for the tube-like nanorings. As a possible application of this effect, it would provide a mechanism of realizing quantum communication by magnetic impurities.

scholarly journals Spin exchange in quantum rings and wires in the Wigner-crystal limit

2005 ◽  
Vol 18 (1) ◽  
pp. L7-L13 ◽  
Author(s):  
Michael M Fogler ◽  
Eugene Pivovarov
Keyword(s):  
Spin Exchange ◽  
Wigner Crystal ◽  
Quantum Rings

INDIRECT EXCHANGE INTERACTION IN Hg1-xMnxTe AND Cd1-xMnxTe ALLOYS

1980 ◽  
Vol 41 (C5) ◽  
pp. C5-289-C5-292 ◽  
Author(s):  
C. Lewiner ◽  
J. A. Gaj ◽  
G. Bastard
Keyword(s):  
Exchange Interaction ◽  
Indirect Exchange Interaction ◽  
Indirect Exchange

Two-electron exchange interaction in the quasimolecular systems with long-range dipole potential

2015 ◽  
Vol 38 (0) ◽  
pp. 45-55
Author(s):  
О. Мирославович Карбованець ◽  
Мирослав Іванович Карбованець ◽  
Володимир Юрійович Лазур ◽  
М. В. Хома
Keyword(s):  
Exchange Interaction ◽  
Long Range ◽  
Electron Exchange ◽  
Dipole Potential ◽  
Electron Exchange Interaction

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.

Electronic properties of quasi two-dimensional transition metals chalcogenides with low-dimensional magnetism

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 87-95
Author(s):  
M. S. Baranava ◽  
P. A. Praskurava
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Exchange Interaction ◽  
Electronic Properties ◽  
Metal Atom ◽  
Transition Metal Atom ◽  
Two Dimensional ◽  
Transition Metal Atoms ◽  
Ground Magnetic ◽  
Low Dimensional

The search for fundamental physical laws which lead to stable high-temperature ferromagnetism is an urgent task. In addition to the already synthesized two-dimensional materials, there remains a wide list of possible structures, the stability of which is predicted theoretically. The article suggests the results of studying the electronic properties of MAX3 (M = Cr, Fe, A = Ge, Si, X = S, Se, Te) transition metals based compounds with nanostructured magnetism. The research was carried out using quantum mechanical simulation in specialized VASP software and calculations within the Heisenberg model. The ground magnetic states of twodimensional MAX3 and the corresponding energy band structures are determined. We found that among the systems under study, CrGeTe3 is a semiconductor nanosized ferromagnet. In addition, one is a semiconductor with a bandgap of 0.35 eV. Other materials are antiferromagnetic. The magnetic moment in MAX3 is localized on the transition metal atoms: in particular, the main one on the d-orbital of the transition metal atom (and only a small part on the p-orbital of the chalcogen). For CrGeTe3, the exchange interaction integral is calculated. The mechanisms of the formation of magnetic order was established. According to the obtained exchange interaction integrals, a strong ferromagnetic order is formed in the semiconductor plane. The distribution of the projection density of electronic states indicates hybridization between the d-orbital of the transition metal atom and the p-orbital of the chalcogen. The study revealed that the exchange interaction by the mechanism of superexchange is more probabilistic.

scholarly journals Laser devices with stacked layers of InGaAs/GaAs quantum rings

2004 ◽  
Vol 15 (4) ◽  
pp. S126-S130 ◽  
Author(s):  
Ferran Suárez ◽  
Daniel Granados ◽  
María Luisa Dotor ◽  
Jorge M García
Keyword(s):  
Quantum Rings ◽  
Laser Devices
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