Physics – Condensed Matter – Materials Science
Scientific paper
2005-03-31
PHYSICAL REVIEW B 72, 233409 (2005)
Physics
Condensed Matter
Materials Science
1 source files, 5 figures
Scientific paper
10.1103/PhysRevB.72.233409
In this paper, we report the applicability of the density matrix renormalization group(DMRG) approach to the cylindrical single wall carbon nanotube (SWCN) for purpose of its correlation effect. By applying the DMRG approach to the $t$+$U$+$V$ model, with $t$ and $V$ being the hopping and Coulomb energies between the nearest neighboring sites, respectively, and $U$ the onsite Coulomb energy, we calculate the phase diagram for the SWCN with chiral numbers ($n_{1}=3, n_{2}=2$), which reflects the competition between the correlation energy $U$ and $V$. Within reasonable parameter ranges, we investigate possible correlated groundstates, the lowest excitations and the corresponding correlation functions in which the connection with the excitonic insulator is particularly addressed.
Lou Jizhong
Su Zhao-Bin
Wang Bing-Shen
Ye Fei
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