Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Correlation effects for semiconducting single wall carbon nanotube: a
  density matrix renormalization group study   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.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys