MEASURING ELECTRON TRANSFER IN REAL SPACE IN BIASED ASYMMETRIC DOUBLE QUANTUM WELLS USING FAR-INFRARED CYCLOTRON RESONANCE

We report measurements of electron transfer in real space in GaAs/AlxGa1−xAs asymmetric double quantum wells under an electric field by far-infrared cyclotron resonance (CR). Due to nonparabolicity, the asymmetric quantum structure results in well-resolved CR lines, which allow contactless measurements of the electron density in each well. Our results show that electrons tunnel through the barrier from one well to the other at the level anticrossing of their ground states.