Quasi-Dirac points in one-dimensional graphene superlattices

• Quasi-Dirac points (QDPs) are found for the first time in one-dimensional graphene superlattices.
• The QDP is different from the traditional Dirac points (TDPs) in graphene superlattices.
• The angular-averaged conductance reaches a minimum value at the QDPs, at which the Fano factor approaches 1/3.
• The minimum conductance at these QDPs may be lower than that at the TDPs under certain conditions.
• The minimum conductance attainable in graphene superlattices was believed to appear at TDPs.

Quasi-Dirac points (QDPs) with energy different from the traditional Dirac points (TDPs) have been found for the first time in one-dimensional graphene superlattices. The angular-averaged conductance reaches a minimum value at the QDPs, at which the Fano factor approaches 1/3. Surprisingly, the minimum conductance at these QDPs may be lower than that at the TDPs under certain conditions. This is remarkable as the minimum conductance attainable in graphene superlattices was believed to appear at TDPs.