Study on Resonant Tunneling via Wannier-Stark States

这已经被用作Zener current flowing a p-i-n diode can be modulated due to interactionbetween the Zener current and Wannier-Stark states，当p-i-n diode has a superlattice in its intrinsic region. in order to investigate detail ofthe interaction,我们carried out transport and optical measurements as good as energy band calculations. The sample我们have used are p-i-n diodes which contains a 15periods of (GaAs) i- 26 D2/(AlAs) i- 26 D2superlattice in the intrisic region. the derivative of conductance measured at 4.2 K exhibits aseries of peaks. The optical measurements （electroreflectance method）应该是Wannier-Stark states are formed in the superlattice region.这些results清楚地指出peaks in the derivative of conductance are due to the resonance between Zener current andwannier-stark states.furthermore,we carried out transport measurements under magnetic field. we have fond out that the peaks showshift due to the magnetic field. More studies are necessary to clarify the origin of the peak shift。

It has been pointed out that Zener current flowing a p-i-n diode can be modulated due to interaction between the Zener current and Wannier-Stark states, when the p-i-n diode has a superlattice in its intrinsic region. In order to investigate detail of the interaction, we carried out transport and optical measurements as well as energy band calculations. The sample we have used are p-i-n diodes which contains a 15periods of (GaAs)ィイD26ィエD2/(AlAs)ィイD26ィエD2 superlattice in the intrisic region. The derivative of conductance measured at 4.2 K exhibits a series of peaks. The optical measurements (electroreflectance method) have shown that the Wannier-Stark states are formed in the superlattice region. These results clearly indicates that the peaks in the derivative of conductance are due to the resonance between Zener current and Wannier-Stark states.Furthermore, we carried out transport measurements under magnetic field. We have fond out that the peaks show shift due to the magnetic field. More studies are necessary to clarify the origin of the peak shift.