Within the Landauer transport formalism we demonstrate that conductance zeros are possible in bipartite systems at half-filling when leads are contacted to different sublattice sites. In particular, we investigate the application of this theory to graphene quantum dots with leads in the armchair configuration. The obtained conductance cancellation is robust in the presence of any single-site impurity.

• Received 27 April 2020
• Revised 3 June 2020
• Accepted 11 June 2020

DOI:https://doi.org/10.1103/PhysRevB.101.235318