Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.186401
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Funding
- NSF [DMR-0704033, DMR-0703992]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0703992] Funding Source: National Science Foundation
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We demonstrate that, in the presence of Coulomb interactions, electrons in graphene behave like a critical system, supporting power law correlations with interaction-dependent exponents. An asymptotic analysis shows that the origin of this behavior lies in particle-hole scattering, for which the Coulomb interaction induces anomalously close approaches. With increasing interaction strength the relevant power law changes from real to complex, leading to an unusual instability characterized by a complex-valued susceptibility in the thermodynamic limit. Measurable quantities, as well as the connection to classical two-dimensional systems, are discussed.
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