Optical response of small carbon clusters

Abstract

We apply the time-dependent local density approximation (TDLDA) to calculate dipole excitations in small carbon clusters. A strong low-frequency mode is found which agrees well with observation for clusters C_n with n in the range 7-15. The size dependence of the mode may be understood simply as the classical resonance of electrons in a conducting needle. For a ring geometry, the lowest collective mode occurs at about twice the frequency of the collective mode in the linear chain, and this may also be understood in simple terms.

19 pages, Latex(Revtex), and 7 figures Postscript; to be published in Zeit. Phys. D; contact is [email protected]

Cited by in corpus (10)

• Real-Space Mesh Techniques in Density Functional Theory
• Application of time-dependent density functional theory to optical activity
• Optical response of small silver clusters
• Violation of the `Zero-Force Theorem' in the time-dependent Krieger-Li-Iafrate approximation
• Can optical spectroscopy directly elucidate the ground state of C20?
• Efficient calculation of van der Waals dispersion coefficients with time-dependent density functional theory in real time: application to polycyclic aromatic hydrocarbons
• Oscillator strengths with pseudopotentials
• Universal nature of collective plasmonic excitations in finite 1-D carbon-based nanostructures
• Sparse-Stochastic Fragmented Exchange for Large-Scale Hybrid TDDFT Calculations
• Multi-plasmon excitations in electron spectra of small systems irradiated by swift charged projectiles