Abstract
We report on our recent experimental studies of vertically coupled quantum point contacts subject to in-plane magnetic fields. Using a novel flip–chip technique, mutually aligned split gates on both sides of sub-micron thick double quantum well heterostructure define a closely coupled pair of ballistic one-dimensional (1D) constrictions. We observe quantized conductance steps due to each quantum well and demonstrate independent control of each 1D constriction width. In addition, a novel magnetoconductance feature at ∼6 T is observed when a magnetic field is applied perpendicular to both the current and growth directions. This conductance dip is observed only when 1D subbands are populated in both the top and bottom constrictions. This data is consistent with a counting model whereby the number of subbands crossing the Fermi level changes with field due to the formation of an anticrossing in each pair of 1D subbands.
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.
