Atomic Collapse and Quasi-Rydberg States in Graphene

Details Atomic Collapse and Quasi-Rydberg States in Graphene Atomic Collapse and Quasi-Rydberg States in Graphene

2007-08-07

arxiv.org/abs/0708.0837v1

Phys. Rev. Lett. 99, 246802 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.246802

Charge impurities in graphene can host an infinite family of Rydberg-like resonance states of massless Dirac particles. These states, appearing for supercritical charge, are described by Bohr-Sommerfeld quantization of collapsing classical trajectories that descend on point charge, in analogy to Rydberg states relation with planetary orbits. We argue that divalent and trivalent charge impurities in graphene is an ideal system for realization of this atomic collapse regime. Strong coupling of these states to the Dirac continuum via Klein tunneling leads to striking resonance effects with direct signatures in transport, local properties and enhancement of the Kondo effect.

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