Formation mechanism of bound states in graphene point contacts
arXiv:1412.1572 · doi:10.1103/PhysRevB.89.045423
Abstract
Electronic localization in narrow graphene constrictions is theoretically studied, and it is found that long-lived quasibound states (QBSs) can exist in a class of ultrashort graphene quantum point contacts (QPCs). These QBSs are shown to originate from the dispersionless edge states that are characteristic of the electronic structure of generically terminated graphene, in which pseudo-time-reversal symmetry is broken. The QBSs can be regarded as interface states confined between two graphene samples, and their properties can be modified by changing the sizes of the QPC and the interface geometry. In the presence of bearded sites, these QBSs can be converted into bound states. Experimental consequences and potential applications are discussed.
10 pages, 6 figures
References in corpus (8)
- Valley filter and valley valve in graphene
- Tailoring the atomic structure of graphene nanoribbons by STM lithography
- Quantum dot behavior in graphene nanoconstrictions
- Perfectly Conducting Channel and Universality Crossover in Disordered Nano-Graphene Ribbons
- Electronic transport in locally gated graphene nanoconstrictions
- Magnetic impurity formation in quantum point contacts
- Edge states on graphene ribbon in magnetic field: interplay between Dirac and ferromagnetic-like gaps
- Disorder induced Coulomb gaps in graphene constrictions with different aspect ratios