Zobrazeno 1 - 10
of 84
pro vyhledávání: '"David B, Hayrapetyan"'
Autor:
Christos S. Garoufalis, Iosif Galanakis, Zaiping Zeng, David B. Hayrapetyan, Sotirios Baskoutas
Publikováno v:
Electronic Materials, Vol 2, Iss 3, Pp 382-393 (2021)
Using a combination of first principles and semiempirical calculation, we explore the structural, electronic, and optical properties of a wide range of perovskite (ABX3) nanoparticle of different size and composition. The variations of the BX3 backbo
Externí odkaz:
https://doaj.org/article/133a769d3ee44c0686fedb5ffceaf8ab
Autor:
Sargis P. Gavalajyan, Grigor A. Mantashian, Gor Ts. Kharatyan, Hayk A. Sarkisyan, Paytsar A. Mantashyan, Sotirios Baskoutas, David B. Hayrapetyan
Publikováno v:
Nanomaterials, Vol 13, Iss 8, p 1393 (2023)
The current work used the effective mass approximation conjoined with the finite element method to study the exciton states in a conical GaAs quantum dot. In particular, the dependence of the exciton energy on the geometrical parameters of a conical
Externí odkaz:
https://doaj.org/article/ec74ba3328c946e3a3ad4d19ac8cf647
Autor:
Davit A. Baghdasaryan, Volodya A. Harutyunyan, David B. Hayrapetyan, Eduard M. Kazaryan, Sotirios Baskoutas, Hayk A. Sarkisyan
Publikováno v:
Nanomaterials, Vol 12, Iss 20, p 3690 (2022)
The exciton states and their influence on the optical absorption spectrum of CdSe and PbS nanoplatelets (NPLs) are considered theoretically in this paper. The problem is discussed in cases of strong, intermediate, and weak size quantization regimes o
Externí odkaz:
https://doaj.org/article/eae602ab70694e85abf52790d8500d29
Autor:
Yuri Y. Bleyan, Paytsar A. Mantashyan, Eduard M. Kazaryan, Hayk A. Sarkisyan, Gianluca Accorsi, Sotirios Baskoutas, David B. Hayrapetyan
Publikováno v:
Nanomaterials, Vol 12, Iss 9, p 1412 (2022)
We have presented a theoretical investigation of exciton and biexciton states for the ground and excited levels in a strongly oblate ellipsoidal quantum dot made from GaAs. The variational trial wave functions for the ground and excited states of the
Externí odkaz:
https://doaj.org/article/11f30ed1b81f4f5aa6fc95b4c595db54
Autor:
Mher A. Mkrtchyan, David B. Hayrapetyan, Eduard M. Kazaryan, Hayk A. Sarkisyan, Maxim Ya. Vinnichenko, Vadim A. Shalygin, Dmitry A. Firsov, Lyudvig S. Petrosyan
Publikováno v:
Nanomaterials, Vol 12, Iss 1, p 60 (2021)
The theoretical investigation of interband and intraband transitions in an asymmetric biconvex lens-shaped quantum dot are considered in the presence of an external magnetic field. The selection rules for intraband transitions are obtained. The behav
Externí odkaz:
https://doaj.org/article/0eb5bc947d4743609b2a57f11afd639b
Autor:
Grigor A. Mantashian, Nare A. Zaqaryan, Paytsar A. Mantashyan, Hayk A. Sarkisyan, Sotirios Baskoutas, David B. Hayrapetyan
Publikováno v:
Atoms, Vol 9, Iss 4, p 75 (2021)
Linear and nonlinear optical properties in colloidal CdSe/CdS core/shell quantum dots with different sizes have been theoretically investigated in the framework of effective mass approximation. The electron states in colloidal CdSe/CdS core/shell qua
Externí odkaz:
https://doaj.org/article/f9e3e0c15515484aa9bd4f0956a28f34
Autor:
Alexandros Barnasas, Christos S. Garoufalis, Dimitrios I. Anyfantis, Nikolaos Bouropoulos, Panagiotis Poulopoulos, David B. Hayrapetyan, Sotirios Baskoutas
Publikováno v:
Atoms, Vol 9, Iss 4, p 70 (2021)
Thin Co films were deposited on quartz and Corning glass by radio frequency magnetron sputtering. The films were postannealed at 500 °C in a furnace in air atmosphere. The resulting samples were examined with X-ray diffraction experiments, which rev
Externí odkaz:
https://doaj.org/article/82f923dcefd944e69d8737530e17d670
Autor:
Grigor A. Mantashian, Paytsar A. Mantashyan, Hayk A. Sarkisyan, Eduard M. Kazaryan, Gabriel Bester, Sotirios Baskoutas, David B. Hayrapetyan
Publikováno v:
Nanomaterials, Vol 11, Iss 5, p 1274 (2021)
By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots en
Externí odkaz:
https://doaj.org/article/53ba69338838445fb360687cc8a751c7
Publikováno v:
Nanomaterials, Vol 10, Iss 10, p 1896 (2020)
In this paper, the behavior of a heavy hole gas in a strongly prolate ellipsoidal Ge/Si quantum dot has been investigated. Due to the specific geometry of the quantum dot, the interaction between holes is considered one-dimensional. Based on the adia
Externí odkaz:
https://doaj.org/article/69a976b9414e4775aae5128dcc8bfdf1
Autor:
Hayk A. Sarkisyan, David B. Hayrapetyan, Lyudvig S. Petrosyan, Eduard M. Kazaryan, Anton N. Sofronov, Roman M. Balagula, Dmitry A. Firsov, Leonid E. Vorobjev, Alexander A. Tonkikh
Publikováno v:
Nanomaterials, Vol 9, Iss 1, p 56 (2019)
This article discusses specific quantum transitions in a few-particle hole gas, localized in a strongly oblate lens-shaped quantum dot. Based on the adiabatic method, the possibility of realizing the generalized Kohn theorem in such a system is shown
Externí odkaz:
https://doaj.org/article/23db74585bd14d63b06f22d53dc8be4f