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Liang S.,Guangzhou University | Xie W.,Guangzhou University | Sarkisyan H.A.,Russian-Armenian (Slavonic) State University | Sarkisyan H.A.,Yerevan State University | And 2 more authors.
Journal of Physics Condensed Matter

We have studied the nonlinear optical absorption and the nonlinear optical rectification of an exciton in a nanoring in the presence of magnetic flux. The calculation results show that one can control the properties of nonlinear optical absorption and nonlinear optical rectification of a nanoring by tuning the outer and inner radius. Moreover, we find that the nonlinear optical properties of a nanoring can be modulated by the magnetic flux through the nanoring. © 2011 IOP Publishing Ltd. Source

Petrosyan L.S.,Jackson State University | Petrosyan L.S.,Russian-Armenian (Slavonic) State University | Shahbazyan T.V.,Jackson State University
Physical Review B - Condensed Matter and Materials Physics

We study resonant tunneling through a periodic square array of quantum dots sandwiched between modulation-doped quantum wells. If a magnetic field is applied parallel to the quantum dot plane, the tunneling current exhibits a highly complex Aharonov-Bohm oscillation pattern due to the interference of multiple pathways traversed by a tunneling electron. Individual pathways associated with conductance beats can be enumerated by sweeping the magnetic field at various tilt angles. Remarkably, Aharonov-Bohm oscillations are aperiodic unless the magnetic field slope relative to the quantum dot lattice axes is a rational number. © 2015 American Physical Society. Source

Liang S.,Guangzhou University | Xie W.,Guangzhou University | Sarkisyan H.A.,Russian-Armenian (Slavonic) State University | Sarkisyan H.A.,Yerevan State University | And 2 more authors.
Superlattices and Microstructures

Optical properties of a nanoring with Winternitz-Smorodinsky confinement potential in the presence of an external magnetic field have been studied theoretically. Our results demonstrate that energy, oscillator strength and the linear, nonlinear and total absorption are strongly affected by size of the nanoring. Also, we found that magnetic field has little influence on energy difference, oscillator strength and optical absorption of the nanoring. © 2012 Elsevier Ltd. All rights reserved. Source

Petrosyan L.S.,Yerevan State Medical University | Petrosyan L.S.,Russian-Armenian (Slavonic) State University
Journal of Physics: Conference Series

We study coherent transport in a system of periodic linear chain of quantum dots situated between two parallel quantum wires. We show that the resonant-tunneling conductance between the wires exhibits a Rabi splitting of the resonance peak as a function of Fermi energy in the wires. This effect is an electron transport analogue of the Rabi splitting in optical spectra of two interacting systems. The conductance peak splitting originates from the anticrossing of Bloch bands in a periodic system that is caused by a strong coupling between the electron states in the quantum dot chain and quantum wires. Source

Gasparyan V.A.,Russian-Armenian (Slavonic) State University
Advanced Materials Research

In the effective-mass approximation the single-electron states in a direct-band CdS/β -HgS/CdS nanocylindrical heterolayer in the presence of strong lateral radial electrostatic field are considered. The explicit forms of the energy spectrum and envelope wave functions of singleparticle states for charge carriers are obtained using variation approach. Corresponding absorption characteristics of interband optical transitions in the layer in the presence of strong radial field are calculated. © (2013) Trans Tech Publications, Switzerland. Source

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