חדשות ואירועים

Manifestations of Electron Interactions in Photogalvanic Effect in Chiral Nanotubes

16.1.12, 12:00
Seminar Room 426/8
Manifestations of Electron Interactions in Photogalvanic Effect in Chiral NanotubesWe consider the influence of electron-electron interaction on the photogalvanic effect in carbon nanotubes that are chiral and metallic. We show that in the limit of strong interactions the mechanism of photo-induced voltage by circularly polarized light is analogous to the Mossbauer effect, and that close to the threshold the photovoltage exhibits a power law singularity characteristic of one dimensional interacting systems. The power of this singularity is dictated by the ratio of the electron density to the momentum shift between the bottoms of the occupied and the first unoccupied subbands. We also characterize the singularities of the photovoltage which appear above the threshold at intervals of the Debye frequency of the plasmons