Resonant Tunneling in Graphene Pseudomagnetic Quantum Dots
journal contributionposted on 12.06.2013, 00:00 by Zenan Qi, D. A. Bahamon, Vitor M. Pereira, Harold S. Park, D. K. Campbell, A. H. Castro Neto
Realistic relaxed configurations of triaxially strained graphene quantum dots are obtained from unbiased atomistic mechanical simulations. The local electronic structure and quantum transport characteristics of y-junctions based on such dots are studied, revealing that the quasi-uniform pseudomagnetic field induced by strain restricts transport to Landau level- and edge state-assisted resonant tunneling. Valley degeneracy is broken in the presence of an external field, allowing the selective filtering of the valley and chirality of the states assisting in the resonant tunneling. Asymmetric strain conditions can be explored to select the exit channel of the y-junction.