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Coulomb interaction and semimetal-insulator transition in graphene

The strong Coulomb interaction between massless Dirac fermions can drive a semimetal-insulator transition in single-layer graphene by dynamically generating an excitonic fermion gap. There is a critical interaction strength $λ_c$ that separates the semimetal phase from the insulator phase. We calculate the specific heat and susceptibility of the system and show that they exhibit distinct behaviors in the semimetal and insulator phases.

preprint2010arXivOpen access
Wei LiGuo-Zhu Liu
cond-mat.mes-hallcond-mat.str-el
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Open access2 authors2 topics
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Wei LiGuo-Zhu Liu

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