Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Poster Session II
HL 85.27: Poster
Donnerstag, 17. März 2011, 18:00–21:00, P4
Photocurrents in Semiconductor Carbon Nanotubes with Spin-Orbit Interaction — Hong Liu1,2, Huynh Thanh Duc1, Stefan Schumacher1, and •Torsten Meier1 — 1Department Physik and CeOPP, Universität Paderborn, D-33098 Paderborn, Germany — 2Physics Department, Nanjing Normal University, Nanjing 210046, China
In recent years, single-walled carbon nanotubes (SWCNTs) have received widespread attention due to their perfect quasi-one-dimensional structure and unique physical properties, as well as their potential for applications. In the present work, we calculate the band structure of SWCNTs using an atomistic tight-binding model including spin-orbit interaction[1]. We combine this approach with a many-particle calculation of the nonlinear optical response using multi-band semiconductor Bloch equations[2]. We show that, for SWCNTs lacking inversion symmetry, the intrinsic spin-orbit interaction can give rise to single-color photoinduced charge and spin currents. In particular, we study the influence of excitonic effects on these photoinduced currents and draw the analogy to recent investigations on single-color injection of photocurrents in semiconductor quantum wells[2].
[1]Hong Liu, Physica B 406, 104-107 (2011)
[2]Huynh Thanh Duc, Jens Förstner, and Torsten Meier, Phys. Rev. B 82, 115316 (2010).