Detection of basepair mismatches in DNA using graphene based nanopore device

We present an unique way to detect basepair mismatches in DNA leading to different epigenetic disorder by the method of nanopore sequencing. Based on a tight-binding formulation of graphene nanopore based device, using Greens function approach we measure the changes in the electronic transport properties of the device as we translocate a double-stranded DNA through the nanopore embeded in a zigzag graphene nanoribbon. In the present work we not only successfully detect the usual AT and GC pairs, but also a set of possible mismatches in the complementary base-pairing without any ambiguity. Our investigation shows that this device can also be used for reliable sequential detection of other biomolecules.