Journal
PHYSICAL REVIEW B
Volume 82, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.153406
Keywords
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Funding
- Hungarian Scientific Research Fund [K72613, CNK80991, TAMOP-4.2.1/B-09/1/KMR-2010-0002]
- Hungarian Academy of Sciences
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We study the quantum-critical properties of antiferromagnetism in graphene at T = 0 within mean-field (MF) theory. The resulting exponents differ from the conventional MF exponents, describing finite-temperature transitions. Motivated by this, we have developed the MF theory of general gapless phases with density of states p(epsilon) similar to vertical bar epsilon vertical bar(r), r > -1, with the interaction as control parameter. For r > 2, the conventional MF exponents a la Landau are recovered, while for -1 < r < 2, the exponents vary significantly with r. The critical interaction is finite for r > 0, therefore no weak-coupling solution exists in this range. This generalizes the results on quantum criticality of the gapless Kondo systems to bulk correlated phases.
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