Wave functions and eigenvalues of charge carriers in a nanotube in a neighborhood of the Dirac point in the presence of a longitudinal electric field

Based on the Hamiltonian for charge carriers in carbon nanotubes with finite lengths, we obtain eigenvalues and eigenfunctions in a neighborhood of the Dirac points (wave functions written analogously to the two-component Dirac wave function are expressed in terms of Hermite polynomials, and the spectrum is equidistant) in the presence of a longitudinal electric field. We express the solution in terms of the Hermite functions in the case of carbon nanotubes with infinite lengths. Based on the obtained wave function for an elongated nanotube, we consider the problem of determining the coefficient of charge carrier transport through the nanotube. The results of finding the transport coefficient can also be applied to other nanoparticles, in particular, to carbon chains and nanotapes. We propose to use the eigenvalues and eigenfunctions of nanotubes with finite lengths to consider the problem of radiation generation in a nonlinear medium based on an array of such noninteracting nanotubes.