Journal
PHYSICAL REVIEW B
Volume 79, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.115423
Keywords
Coulomb blockade; fermion systems; graphene; nanostructured materials; quantum dots
Funding
- FWF-SFB Adlis
- NCCR
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We present realistic simulations of quantum confinement effects in phase-coherent graphene quantum dots with linear dimensions of 10-40 nm. We determine wave functions and energy-level statistics in the presence of disorder resulting from edge roughness, charge impurities, or short-ranged scatterers. Marked deviations from a simple Dirac billiard for massless fermions are found. We find a remarkably stable dependence of the nearest-neighbor level spacing on edge roughness suggesting that the roughness of fabricated devices can be possibly characterized by the distribution of measured Coulomb blockade peaks.
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