Abstract
Conductance fluctuations (CF) have been observed when an in-plane magnetic field is applied to 800 nm-wide mesoscopic wires fabricated from GaAs/(AlGa)As double quantum well structures. This shows that the inter-well tunnelling transition preserves electron phase coherence. The CF disappear when the magnetic field becomes large enough to suppress tunnelling between the quantum wells. The CF amplitude is smaller when the tunnelling rate is reduced either by unbalancing the double well potential, or by increasing the thickness of the tunnel barriers. The wires display a strong magnetoresistance feature as the wells are decoupled by the in-plane magnetic field. This has been seen in macroscopic Hall bars, but is modified due to diffuse edge scattering in the wires.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Physica E: Low-dimensional Systems and Nanostructures
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
