University of Cambridge > Talks.cam > Semiconductor Physics Group Seminars > Hyperspectral imaging of exciton dynamics in individual carbon nanotubes controlled by high magnetic fields

  Browse A-Z

Log in

Cambridge users (raven)details Other usersdetails No account?details

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

Hyperspectral imaging of exciton dynamics in individual carbon nanotubes controlled by high magnetic fields

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Teri Bartlett.

Semiconducting carbon nanotubes (CNTs) provide an exceptional platform for studying one dimensional excitons (bound electron-hole pairs), but the role of defects and quenching centres in controlling emission remains controversial. Here we show that by wrapping the CNT in a polymer sheath and cooling to 4.2 K, ultra-narrow photoluminescence (PL) emission linewidths below 80 micro-eV can be seen from individual solution processed CNTs. Hyperspectral imaging of the tubes identifies local emission sites and shows that previously dark quenching segments can be brightened by the application of high magnetic fields and their effect on exciton transport and dynamics can be controlled. Using focused high intensity laser irradiation we introduce a single defect into an individual nanotube which reduces its quantum efficiency by the creation of a shallow bound exciton state with enhanced electron-hole exchange interaction. The emission intensity of the nanotube is then reactivated by the application of the high magnetic field.

This talk is part of the Semiconductor Physics Group Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

Cambridge Parasitology Club Meetings 2012-13 Technology Enterprise Group Seminar Series Visual rhetoric and modern South Asian history (2013) Individual in the Labour Market Research Group Innovation In Emerging Markets Biotechnology Seminar Series

Other talks

Symplectic topology of K3 surfaces via mirror symmetry Architecture and the English economy, 1200-1500: a new history of the parish church over the longue durée An investigation into hepatocyte expression and prognostic significance of senescence marker p21 in canine chronic hepatitis Ethics for the working mathematician, seminar 9 CANCELLED Active Subspace Techniques to Construct Surrogate Models for Complex Physical and Biological Models Statistical Methods in Pre- and Clinical Drug Development: Tumour Growth-Inhibition Model Example Dynamics of Phenotypic and Genomic Evolution in a Long-Term Experiment with E. coli TBC Constructing the virtual fundamental cycle The Partition of India and Migration Stokes-Smoluchowski-Einstein-Langevin theory for active colloidal suspensions
 

© 2006-2024 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity