You are here

Ultrafast Terahertz Probes of Interacting Dark Excitons in Chirality-Specific Semiconducting Single-Walled Carbon Nanotubes

TitleUltrafast Terahertz Probes of Interacting Dark Excitons in Chirality-Specific Semiconducting Single-Walled Carbon Nanotubes
Publication TypeJournal Article
Year of Publication2015
AuthorsLuo, L, Chatzakis, I, Patz, A, Wang, JG
JournalPhysical Review Letters
Volume114
Pagination107402
Date Published03
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000351433500009
Keywordsabsorption
Abstract

Ultrafast terahertz spectroscopy accesses the dark excitonic ground state in resonantly excited (6,5) single-walled carbon nanotubes via internal, direct dipole-allowed transitions between the lowest-lying dark-bright pair state of similar to 6 meV. An analytical model reproduces the response that enables the quantitative analysis of transient densities of dark excitons and e-h plasma, oscillator strength, transition energy renormalization, and dynamics. Nonequilibrium, yet stable, quasi-one-dimensional quantum states with dark excitonic correlations rapidly emerge even with increasing off-resonance photoexcitation and experience a unique crossover to complex phase-space filling of both dark and bright pair states, different from dense two-and three-dimensional excitons influenced by the thermalization, cooling, and ionization to free carriers.

DOI10.1103/PhysRevLett.114.107402
Custom 1

Metamaterials