Electric field effects on excitons in cylindrical quantum dots with asymmetric axial potential. Influence on the nonlinear optical properties

Acosta, Rubén E.; Zapata, Alejandro Uribe; Duque, C.A.

doi:10.1016/j.physe.2012.05.027

Cited by 19 publications

(6 citation statements)

References 37 publications

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“…However, since the asymmetric system can accommodate less confined levels, there is a wider range of central barrier heights in which -compared with the symmetric quantum well case-no intersubband transition occurs and the optical responses considered are not present. But in the particular configurations where these transitions between the confined ground and first excited are possible, the magnitude of the optical rectification peak is more than order of magnitude larger than its corresponding one in -for example-asymmetric Pöschl-Teller quantum wells [24]; and of the same order of magnitude than v 0,max in the case of exciton-related nonlinear optical rectification in asymmetric cylindrical quantum dots under the influence of an external electric field [25]. Therefore, we may conclude that a compositionally graded heterostructure like the inverse parabolic QW could find application as an optical rectifier.…”

Section: Discussionmentioning

confidence: 92%

Electron states and related optical responses in asymmetric inverse parabolic quantum wells

Duque

2013

Superlattices and Microstructures

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The article reports the obtention of the conduction band energy states for electrons in a Al x Ga 1Àx As-based quantum well with inverse parabolic confinement. Accordingly, it has been possible to calculate the intersubband electron-transition-related optical absorption and rectification coefficients. The comparison between the results in the cases of symmetric and asymmetric rectangular barrier configurations allows to verify the possibility of the second-order optical rectification in the asymmetric case as well as a rather drastic change in the absorption coefficient as a function of the height of the inverse parabolic potential in such a configuration.

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Section: Discussionmentioning

confidence: 92%

Electron states and related optical responses in asymmetric inverse parabolic quantum wells

Duque

2013

Superlattices and Microstructures

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“…Makalede yazarlar, soğurma katsayısının maksimumu elektrik alanın artmasıyla, düşmesi ve gelen foton enerjisine göre sağa kaymasını gözlemlemişler. Buna benzer sonuçlar [15][16][17][18][19][20][21] makalelerinde de elde edilmiştir.…”

Section: Introductionunclassified

Yarıiletken Silindirik Kuantum Noktanın Optik Özellikleri

Babanli

Sabyrov

2022

Süleyman Demirel Üniversitesi Fen Edebiyat Fakültesi Fen Dergisi

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Bu çalışmada yarıiletken silindirik kuantum noktanın optik özellikleri araştırılmıştır. Etkin kütle ve parabolik bant yaklaşımı dikkate alınarak yarıiletken silindirik kuantum noktanın enerji spektrumu ve dalga fonksiyonu köşegenleştirme yöntemiyle hesaplanmıştır. Elde ettiğimiz öz değer ve öz fonksiyon ifadelerini kullanarak alt enerji seviyeler arası optik geçişler için soğurma katsayısını hesaplamak için kullanılmıştır. Yarıiletken silindirik kuantum noktanın soğurma katsayısı gelen foton enerjisinin fonksiyonu olarak silindirin yarıçapı ve yüksekliği gibi parametrelerinin farklı değerlerine göre davranışı sayısal olarak araştırılmıştır. Ayrıca soğurma katsayı manyetik alanın farklı değerlerine göre değişimi araştırılmıştır. Elde edilen sonuçlara göre yarıiletken kuantum noktanın soğurma katsayısı manyetik alanın değişiminden bağımsız ve silindirin yarıçap ve yükseklik parametrelerinin değişimine bağlı olduğu görülmüştür.

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“…On the other hand, the nonlinear optical properties of QD structures have also been considered quite extensively in the literature (see, for instance, , and references therein). Actually, it is not possible to underrate the importance of the study of the optical responses in these quantum nanosystems.…”

Section: Introductionmentioning

confidence: 99%

Effects of applied electric fields on optical responses in elliptical quantum nanosystems

Miranda-Pedraza

Ospina

Giraldo-Tobón

2016

Phys. Status Solidi B

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The optical absorption response of an elliptical quantum‐dot‐type nanostructure is investigated by numerically determining the electron states within the effective mass and parabolic approximations via the finite element method, taking into account the effect of an externally applied electric field. Validation of the numerical procedure is discussed through the comparison with analytical results of previous works for zero external field conditions. For finite field, the comparison is made with the outcome of degenerate perturbation theory. The calculated electron energies and wavefunctions are used to evaluate the linear and nonlinear light absorption and refractive index change coefficients in the system. Their corresponding expressions are those typically derived within a perturbative approach for solving the density matrix equation of motion. It is shown how the electric field and the change in the elliptical geometry affect the optical response of the considered structures. The extension of the treatment to consider the properties of elliptic nanoparticles under external field influences is briefly discussed.

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Electric field effects on excitons in cylindrical quantum dots with asymmetric axial potential. Influence on the nonlinear optical properties

Cited by 19 publications

References 37 publications

Electron states and related optical responses in asymmetric inverse parabolic quantum wells

Electron states and related optical responses in asymmetric inverse parabolic quantum wells

Yarıiletken Silindirik Kuantum Noktanın Optik Özellikleri

Effects of applied electric fields on optical responses in elliptical quantum nanosystems

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