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TT: Tiefe Temperaturen

TT 33: Transport - Nanoelectronics III: Molecular Electronics

TT 33.11: Talk

Tuesday, March 8, 2005, 16:45–17:00, TU H3027

Non-linear transport properties in commensurate and incommensurate double-walled carbon nanotubes — •Shidong Wang and Milena Grifoni — Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany

We use a tight-binding model to investigate the effective intershell coupling in double-walled carbon nanotubes. We derive an analytical expression for the effective intershell coupling and find selection rules. The intershell coupling between lowest bands is significantly suppressed if two shells are incommensurate. Including the long-ranged Coulomb interactions, double-walled carbon nanotubes can be described by Luttinger liquid theory at low energies. The tunneling density of states and the non-linear I-V characteristics of double-walled carbon nanotubes are also obtained.