Effect of an AC electric field on the conductance of single-wall semiconductor-type carbon nanotubes

Interaction of two-dimensional electromagnetic breathers in an array of carbon nanotubes

“…We studied the propagation and interaction of laser pulses in the array of zigzag (m, 0) carbon nanotubes at the following parameters of the system of interest: m = 7, γ 0 = 2.7 eV, b = 1.42 × 10 -8 cm, d x ≈ 2.13 × 10 -8 cm, n 0 = 2 × 10 18 cm -3 [14], T = 77 K, ε = 4, ω 0 ≈ 10 14 g -1 (see Eq. (7)).…”

“…According to Eqs. (8) and (11), the electric field in the array of nanotubes can be found as E = E 0 Ψ(υ, ζ, τ), where the function Ψ(υ, ζ, τ) has the form (14) and the quantity E 0 is given by Eq. (9).…”

“…We will assume that the nanotubes are immersed into a homogeneous insulator, the axes of the nanotubes are parallel to the common Ox axis and the distance between the adjacent nanotubes are large compared their diameter, which allows neglecting the interaction between the nanotubes [14]. The dispersion relation of conduction band elec trons of the nanotubes in the chosen geometry has the form (1) where the electron quasi momentum is specified as p = {p x , s}, s is the number characterizing the momen tum quantization along the perimeter of a nanotube (s = 1, 2,…, m), γ 0 is the overlap integral, d x = 3b/2 [2].…”

Interaction of carbon dioxide laser radiation with a nanotube array in the presence of a constant electric field

“…As in [9], we perform the transformation p z p zeA z /c in Eq. (3), which is equivalent to the introduc tion of the generalized momentum P z = p z + eA z /c.…”

“…A large number of studies are devoted to the transport properties of carbon nanotubes exposed either to a constant electric field or to a wave electromagnetic field only. In [9], the effect of an alternating electric field on the conductivity of a system of single wall semiconductor type NTs under a constant electric field was studied. The dependence of the current den sity in the system on the characteristics of applied fields was determined, and the effect of the absolute negative conductivity was detected.…”