Abstract
Aharonov-Bohm (AB) interference is reported for the first time in the conductance of a vertical nanostructure based on a single quantum well (QW). The two lowest subbands of the well are spatially separated by the Hartree barrier originating from electronic repulsion in the modulation-doped QW and provide AB two-path geometry. Split-gates control the in-plane electronic momentum dispersion. In our system, we have clearly demonstrated AB interference in both electrostatic and magnetic modes. In the latter case the magnetic field was applied parallel to the QW plane, and perpendicular to the AB loop. In the electrostatic mode of operation the single-QW scheme adopted led to large transconductance oscillations with relative amplitudes exceeding 30%. The relevance of the present design strategy for the implementation of coherent nanoelectronic devices is underlined.
- Received 18 July 2000
DOI:https://doi.org/10.1103/PhysRevB.62.R10630
©2000 American Physical Society