Work

Electron-Electron Interaction Effects on the Optical Excitations of Semiconducting Single-Walled Carbon Nanotubes

Year: 2004

Type: article

Abstract: We report correlated-electron calculations of optically excited states in ten semiconducting single-walled carbon nanotubes with a wide range of diameters. Optical excitation occurs to excitons whose binding energies decrease with increasing nanotube diameter, and are smaller than the binding energy of an isolated strand of poly-(paraphenylene vinylene). The ratio of the energy of the second optical exciton polarized along the nanotube axis to that of the lowest exciton is smaller than the value predicted within single-particle theory. The experimentally observed weak photoluminescence is an intrinsic feature of semiconducting nanotubes.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.93.157402

Authors: Hongbo Zhao, Sumit Mazumdar

Institution: University of Arizona

Language: English

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Division of Materials Research

Awards: Infrared Photorefractive and Light-Emitting Polymers for Optical Technologies, Electron-Electron Interactions and the Photophysics of Semiconducting Conjugated Polymers and Single-Walled Carbon Nanotubes