Pregled bibliografske jedinice broj: 439152
InGaAs/GaAs quantum dots within an effective approach
InGaAs/GaAs quantum dots within an effective approach // Physica. E, Low-dimensional systems and nanostructures, 41 (2009), 7; 1358-1363 doi:10.1016/j.physe.2009.04.002 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 439152 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
InGaAs/GaAs quantum dots within an effective approach
Autori
Filikhin, I. ; Suslov, V. M. ; Wu, M. ; Vlahović, Branislav
Izvornik
Physica. E, Low-dimensional systems and nanostructures (1386-9477) 41
(2009), 7;
1358-1363
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
quantum dots ; single carrier levels ; Coulomb interaction ; excitons ; opitical properties
Sažetak
An effective approach for describing the electronic structure of InGaAs/GaAs quantum dots (QDs) is presented. We model QDs based on a single sub-band approach with an energy-dependent electron effective mass. The model assumes that the total effect of inter-band interactions, strain and piezoelectricity can be taken into account by an effective potential. Using this approximation, we define a strength parameter of the effective potential to reproduce capacitance–gate-voltage (CV) experimental data for InAs/GaAs QDs. In the present work, we expand the model to describe InxGa1−xAs QDs with significant Ga fractions. We find that our model accurately describes CV and photoluminescence (PL) data for QDs, assuming 22% Ga fractions, and also reproduces the experimental data for Coulomb shifts of exciton complexes (X−, X+, XX). We compared our results with those from atomistic pseudopotential and eight-band kp-Hamiltonian approaches. The strength of the electron and heavy hole confinements is found to be weaker in the kp-model than in the atomistic pseudopotential approach.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
POVEZANOST RADA
Projekti:
098-0000000-3194 - Nuklearne Interakcije
Ustanove:
Institut "Ruđer Bošković", Zagreb
Profili:
Branislav Vlahovic
(autor)
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus