Energy Band and Absorption Coefficient of Quantum Dots in a Well Structure

• Authors: P. Zhang , X. Lu , C. Zhang , J. Yao
• Languages of publication: EN

Abstracts

EN

Building on the effective-mass envelope function theory, this paper focuses on the study of the energy band and the absorption coefficient of InAs/In_{x}Ga_{1 - x}As quantum dots in a well (DWELL) structure. In contrast to InAs/In_{0.15}Ga_{0.85}As quantum DWELL, the InAs/In_{0.2}Ga_{0.8}As quantum DWELL has lower ground states. With the thickness of In_{0.15}Ga_{0.85}As layer changing from 7 nm to 9 nm and In_{0.2}Ga_{0.8}As layer changing from 9 nm to 12 nm, the calculation shows that their absorption coefficient spectra takes a red shift in the long-wave infrared and far-infrared ranges, respectively. Moreover, when the thickness of the In_{x}Ga_{1 - x}As layer is defined as 9 nm, the absorption coefficient spectra of InAs/In_{0.2}Ga_{0.8}As DWELL shows a obvious red shift comparing with that of InAs/In_{0.15}Ga_{0.85}As DWELL.

Keywords

EN

73.21.La; 73.63.Kv

Discipline

• 73.21.La: Quantum dots
• 73.63.Kv: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 1
• Pages: 197-201

Dates

published

2012-07

received

2011-12-18

(unknown)

2012-04-15

Contributors

author

P. Zhang

• Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics , and TEDA Applied Physics School, Nankai University, Tianjin 300457, P.R. China

author

X. Lu

• Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics , and TEDA Applied Physics School, Nankai University, Tianjin 300457, P.R. China

author

C. Zhang

• Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics , and TEDA Applied Physics School, Nankai University, Tianjin 300457, P.R. China

author

J. Yao

• Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics , and TEDA Applied Physics School, Nankai University, Tianjin 300457, P.R. China

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Identifiers

DOI

10.12693/APhysPolA.122.197