Highly sensitive photocurrent spectroscopy of resonant couplings between GaAs/AlAs superlattice Stark ladders and GaAs single quantum well states
Nogami, T. ; Kawasaki, K. ; Kawashima, K. ; Fujiwara, K.
[S.l.] : American Institute of Physics (AIP)
Published 2000
[S.l.] : American Institute of Physics (AIP)
Published 2000
| ISSN: |
1089-7550
|
|---|---|
| Source: |
AIP Digital Archive
|
| Topics: |
Physics
|
| Notes: |
We have investigated interactions between the localized states in a single quantum well (SQW) embedded in the center of a superlattice (SL) and the Wannier–Stark ladder states in the SL by low temperature photocurrent (PC) spectroscopy using numerical differentiation for an analysis of the measured PC spectra. It is found that the PC spectra show drastic changes of transition energies and oscillator strengths due to resonances between the SQW localized states and the extended SL Stark ladder states. We demonstrate high sensitivity of PC spectroscopy by introducing the differentiated spectra and gray-scale representation. Based on transfer matrix calculations of the eigen energies and wave function overlap integrals, the observed anticrossings and delocalization phenomena are rigorously explained. © 2000 American Institute of Physics.
|
| Type of Medium: |
Electronic Resource
|
| URL: |