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Electric field effects on reduced effective masses of minibands at the mini-Brillouin-zone center and edge in a GaAs/AlAs superlattice.
- Source :
-
Journal of Applied Physics . Mar2012, Vol. 111 Issue 5, p053523. 4p. 5 Graphs. - Publication Year :
- 2012
-
Abstract
- We have investigated the electric-field-strength dependence of the reduced effective masses of the minibands in a GaAs/AlAs superlattice embedded in a p-i-n diode structure with use of electroreflectance spectroscopy. Frantz-Keldysh (FK) oscillations are observed in the energy region between the n = 1 heavy hole to electron transition at the mini-Brillouin-zone center (kz = 0: Γ point) and that at the edge (kz = π/D: π point), where D is the superlattice period. Analyzing the FK oscillations, we evaluate the reduced effective masses at the Γ and π points as a function of electric field strength. The evaluated reduced effective masses are consistent with the values estimated from the calculated miniband dispersion relations in a low electric field regime. It is found that the reduced effective masses tend to be heavier at a given electric field strength. Considering the electric-field-strength dependence of eigenstates calculated using a transfer-matrix method, we conclude that an increase of the reduced effective masses originates from weak localization of the electron envelope function in the transformation process from the miniband to Stark-ladder states in Wannier-Stark localization. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ELECTRIC fields
*SUPERLATTICES
*OSCILLATIONS
*SEMICONDUCTORS
*ELECTROSTATICS
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 111
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 73444124
- Full Text :
- https://doi.org/10.1063/1.3692051