金属锯齿形碳纳米管的Phase diagrams
Phase diagrams of the metallic zigzag carbon nanotube
摘要：
我们研究了金属锯齿形碳纳米管的哈伯德模型，其中包括在现场和最近邻相互作用。假设弱相互作用，一个重整化群分析的等效双腿阶梯其次是玻色化和玻色化的结果在一个Gross-Neveu模型与扩大的对称性相对于原来的哈密顿量。对于未掺杂的情况，Gross-Neveu模型的对称性是SO（8），但对于掺杂的情况，粒子-空穴对称性被破坏，对称性降低到SO（6）。在未掺杂的碳纳米管中发现了四个具有排斥相互作用的基态相：d波莫特绝缘体、s波莫特绝缘体、p密度波和电荷密度波。掺杂的情况下有两个基态阶段，d-波超导体和一个阶段，其中的p-密度波和电荷密度波共存。我们还探讨了全球相图与一般的相互作用配置文件，并找到几个额外的状态，包括手性电流相，电流沿锯齿形债券周围的纳米管流动。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
