Correlations in Hexagonal Lattice Systems - Application to Carbon Nanotubes
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We present exact diagonalization studies of two-dimensional electron gas on hexagonal lattice. Using Lanczös method we analyze the influence of the Coulomb correlations on the density of states and spectral functions. Choosing appropriate boundary conditions we simulate the geometry of a single wall carbon nanotube. In particular, integration over the boundary condition in one direction and summation in the other one allows us to perform cluster calculations for a tube-like system with a finite diameter and infinite length.
- 1. see e.g., J.K. Cullum, R.A. Willonghby, Lanczos Algorithms for Large Symmetric Eigenvalue Computation, Birkhauser, Boston 1985
- 2. D. Poiblanc, Phys. Rev. B, 44, 9562, 1991; C. Gross, Z. Phys. B, 86, 359, 1992; Phys. Rev. B, 53, 6865, 1996
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