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Terahertz Luminescence and Absorption under Impurity Breakdown in Quantum Wells and Strained Semiconductor Layers

100%

Vorobjev L., Firsov D., Shalygin V., Panevin V., Sofronov A., Ustinov V., Zhukov A., Egorov A., Andrianov A., Zakhar'in A., Ganichev S., Danilov S., Kozlov D.

Acta Physica Polonica A

2008

vol. 113

issue 3

925-928

We present the results of THz luminescence investigations in structures with Si-doped quantum wells and Be-doped GaAsN layers under strong lateral electric field. The peculiar property of these structures is the presence of resonant impurity states which arise due to dimensional quantization in quantum wells and due to built-in strain in GaAsN epilayers. The experimentally obtained THz emission spectra consist of the lines attributed to intra-center electron transitions between resonant and localized impurity states and to the electron transitions involving the subband states. Absorption of THz radiation and its temperature dependence was also studied in structure with tunnel-coupled quantum wells at equilibrium conditions and under electric field.

Light Absorption and Photoluminescence in Quantum Dots and Artificial Molecules

88%

Firsov D., Vorobjev L., Panevin V., Fedosov N., Shalygin V., Samsonenko J., Tonkikh A., Cirlin G., Andreev A., Kryzhanovskaya N., Tarasov I., Pikhtin N., Ustinov V., Hanna S., Seilmeier A., Julien F., Zakharov N., Werner P.

Acta Physica Polonica A

2005

vol. 107

issue 1

158-162

Intraband absorption in n- and p-doped structures with InAs/GaAs quantum dots covered by InGaAs layers is studied both experimentally and theoretically. The absorption cross-section for p-type quantum dots was found to be significantly smaller than that for n-type quantum dots. Interband absorption bleaching under strong interband excitation is found and investigated in undoped quantum dot structures. Structures with artificial molecules were grown. Photoluminescence spectra and transmission electron microscopy images proves the presence of coupled symmetrical quantum dots.

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2 Acta Physica Polonica A

1 2008

1 2005

2 Firsov D.

2 Panevin V.

2 Shalygin V.

2 Ustinov V.

2 Vorobjev L.

1 Andreev A.

1 Andrianov A.

1 Cirlin G.

1 Danilov S.

1 Egorov A.

1 Fedosov N.

1 Ganichev S.

1 Hanna S.

1 Julien F.

1 Kozlov D.

1 Kryzhanovskaya N.

1 Pikhtin N.

1 Samsonenko J.

1 Seilmeier A.

1 Sofronov A.

1 Tarasov I.

1 Tonkikh A.

1 Werner P.

1 Zakhar'in A.

1 Zakharov N.

1 Zhukov A.

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Terahertz Luminescence and Absorption under Impurity Breakdown in Quantum Wells and Strained Semiconductor Layers

Light Absorption and Photoluminescence in Quantum Dots and Artificial Molecules