Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 76: Carbon nanotubes
HL 76.4: Vortrag
Donnerstag, 19. März 2015, 12:15–12:30, EW 015
Carbon nanotubes under strain: Electronic and Optical properties — •Christian Wagner1, Jörg Schuster2, Michael Schreiber3, and Thomas Gessner1,2 — 1Center for Microtechnologies, TU Chemnitz, Germany — 2Fraunhofer Institute ENAS, Chemnitz, Germany — 3Institute of Physics, TU Chemnitz, Germany
Carbon nanotubes (CNTs) are becoming interesting for applications as they show some very unique properties upon strain: On load, their whole electronic band structure is shifting (according to their chiralities) and that makes them suitable for electronic and optical strain sensing at the nano scale.
We show the results of electronic structure calculations of strained CNTs (DFT and beyond) and the link to their electronic and optical properties. It can be shown that an empirical model can account for the CNT bands and their strain-dependent properties.
Based on the electronic structure, we derive transport properties of strained CNTs and their mixtures in a transistor configuration. For the modeling of the optical properties, we show optical spectra derived from electronic structure calculations. The optical spectra of unstrained CNTs are described by empirical models [1]. We aim to incorporate strain effects into these models by comparison to electronic structure calculations.
[1] K. Liu et al., Nat. Nanotech. 7, 325 (2012)