Community Research and Development Information Service - CORDIS



Project ID: 336749
Funded under: FP7-IDEAS-ERC
Country: Germany

Mid-Term Report Summary - QUANTUMCANDI (Interfacing quantum states in carbon nanotube devices)

The main objective of the project is to study the fundamentals of light-matter interaction in semiconducting single-walled carbon nanotubes, and to utilize the nanotube photophysical phenomena in novel quantum devices. In terms of fundamental photophysical properties of carbon nanotubes, the project has identified cryogenic localization of photo-excited electron-hole pairs strongly correlated by dimensionality-enhanced Coulomb interaction as ubiquitous in all carbon nanotube materials. Moreover, it was found that environmental disorder and structural covalent defects of nanotube side-walls promote exciton localization in shallow and deep potentials, respectively. Exciton localization is accompanied by broken nanotube symmetry which in turn gives rise to permanent dipole moments of defect-localized excitons. In the presence of additional charges trapped in defect potentials, nanotubes exhibit photoluminescence from charged localized excitons, so-called trions. Nanotube-based field-effect devices realized as a key milestone of the project were used to quantify the permanent dipole moments associated with exciton localization on the one hand, and to control the charge state of defect-localized excitons with a gate voltage on the other hand. Both features of localized neutral and charged nanotube excitons are viable for the development of nanotube-based devices for sensing of external electric and magnetic fields. Related research will be pursued in the remaining period of the project with emphasis to optical detection of the spin degrees of freedom of neutral and charged excitons in carbon nanotubes. Progress along this line of research will be facilitated by cavity-enhanced spectroscopy techniques for optical studies of individual nanotubes developed as another key project milestone. Furthermore, the progress achieved in the control and optimization of nanotube synthesis, functionalization and cryogenic spectroscopy during the initial phase will ensure the success of further project developments.

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