Phase diagrams of the metallic zigzag carbon nanotube

Details Phase diagrams of the metallic zigzag carbon nanotube Phase diagrams of the metallic zigzag carbon nanotube

2008-03-21

arxiv.org/abs/0803.3107v2

PRB, Vol.78, No.3, 035401 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 9 figures

Scientific paper

10.1103/PhysRevB.78.035401

We investigate a metallic zigzag carbon nanotube by means of a Hubbard model which includes both on-site and nearest neighbour interactions. Assuming weak interactions, a renormalization group analysis of the equivalent two-leg ladder followed by bosonization and refermionization results in a Gross-Neveu model with an enlarged symmetry relative to the original Hamiltonian. For the undoped case the symmetry of the Gross-Neveu model is SO(8), but for the doped case the particle-hole symmetry is broken and the symmetry reduces to SO(6). Four ground state phases are found in the undoped carbon nanotube with repulsive interactions, a d-wave Mott insulator, an s-wave Mott insulator, a p-density wave and a charge density wave. The doped case has two ground state phases, a d-wave superconductor and a phase where a p-density wave and a charge density wave co-exist. We also explore the global phase diagram with a general interaction profile and find several additional states, including a chiral current phase where current flows around the nanotube along the zigzag bonds.

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