Correlation and dimensional effects of trions in carbon nanotubes

Details Correlation and dimensional effects of trions in carbon nanotubes Correlation and dimensional effects of trions in carbon nanotubes

2010-05-21

arxiv.org/abs/1005.4040v1

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevB.81.205446

We study the binding energies of singlet trions, i.e. charged excitons, in carbon nanotubes. The problem is modeled, through the effective-mass model, as a three-particle complex on the surface of a cylinder, which we investigate using both one- and two-dimensional expansions of the wave function. The effects of dimensionality and correlation are studied in detail. We find that the Hartree-Fock approximation significantly underestimates the trion binding energy. Combined with band structures calculated using a non-orthogonal nearest neighbour tight binding model, the results from the cylinder model are used to compute physical binding energies for a wide selection of carbon nanotubes. In addition, the dependence on dielectric screening is examined. Our findings indicate that trions are detectable at room temperature in carbon nanotubes with radius below 8{\AA}.

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