Multi-excitonic effects on optical spectra of semiconducting carbon nanotubes

Watanabe, Kouta; Asano, Kenichi; Ogawa, T.

doi:10.1088/1742-6596/148/1/012053

Cited by 1 publication

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the last six years, many papers have investigated biexcitons and nonlinear optical properties of CNTs. 16,17,19,21,[44][45][46][47][48][49][50][51] Biexcitons in CNTs were first studied 16 by Pedersen et al in 2005. In this work the authors used a cylindrical geometry and assumed that the biexciton was completely delocalized around the circumference to arrive at an effective one-dimensional Hamiltonian. The problem was solved using a Gaussian basis expansion and it was concluded that biexcitons in CNTs are stable particles.…”

Section: A Brief Review Of Past Cnt Biexciton Effortsmentioning

confidence: 99%

Biexciton binding energy in fractional dimensional semiconductors

2012

View full text Add to dashboard Cite

Biexcitons in fractional dimensional spaces are studied using variational quantum Monte Carlo. We investigate the biexciton binding energy as a function of the electron-hole mass fraction σ as well as study the dimensional dependence of biexcitons for σ = 0 and σ = 1. As our first application of this model we treat the H 2 molecule in two and three dimensions. Next we investigate biexcitons in carbon nanotubes within the fractional dimensional model. To this end we find a relation between the nanotube radius and the effective dimension. The results of both applications are compared with results obtained using different models and we find a reasonable agreement. Within the fractional dimensional model we find that the biexciton binding energy in carbon nanotubes accurately scales as E B (r,ε) = 1280 meV Å/(rε), as a function of radius r and the dielectric screening ε.

show abstract