TY - JOUR
T1 - Strain distribution and electronic states in stacked InAs/GaAs quantum dots with dot spacing 0-6nm
AU - Saito, T.
AU - Nakaoka, T.
AU - Kakitsuka, T.
AU - Yoshikuni, Y.
AU - Arakawa, Y.
N1 - Funding Information:
This work was supported in part by the IT program from MEXT, Japan.
PY - 2005/2
Y1 - 2005/2
N2 - We have calculated the strain distribution and electronic structures in stacked InAs/GaAs quantum dots (QDs) with the dot spacing 6-0nm. We used the elastic continuum theory for the strain distribution, and the 8-band k·p theory for the electronic structures. For the triply stacked QDs, the light-hole (LH) component of the hole ground state increases with decreasing the dot spacing. The LH component in the columnar QD (dot spacing 0nm) reaches 21.1% which is 4.8 times larger than that in the single QD due to the reduction of the biaxial strain. Further increase of the LH component (up to 28.6%) is obtained in the fivefold-stacked columnar QD. This result suggests a possibility of increase in the TM-mode transition in the columnar QDs.
AB - We have calculated the strain distribution and electronic structures in stacked InAs/GaAs quantum dots (QDs) with the dot spacing 6-0nm. We used the elastic continuum theory for the strain distribution, and the 8-band k·p theory for the electronic structures. For the triply stacked QDs, the light-hole (LH) component of the hole ground state increases with decreasing the dot spacing. The LH component in the columnar QD (dot spacing 0nm) reaches 21.1% which is 4.8 times larger than that in the single QD due to the reduction of the biaxial strain. Further increase of the LH component (up to 28.6%) is obtained in the fivefold-stacked columnar QD. This result suggests a possibility of increase in the TM-mode transition in the columnar QDs.
KW - Electronic states
KW - Stacked quantum dots
KW - Strain
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U2 - 10.1016/j.physe.2004.08.055
DO - 10.1016/j.physe.2004.08.055
M3 - Conference article
AN - SCOPUS:13444273242
SN - 1386-9477
VL - 26
SP - 217
EP - 221
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
IS - 1-4
T2 - International Conference on Quantum Dots
Y2 - 10 May 2004 through 13 May 2004
ER -