Which nanowire couples better electrically to a metal contact: Armchair or zigzag nanotube?

Anantram, M. P.
April 2001
Applied Physics Letters;4/2/2001, Vol. 78 Issue 14, p2055
Academic Journal
The fundamental question of how chirality affects the electronic coupling of a nanotube to metal contacts is important for the application of nanotubes as nanowires. We show that metallic-zigzag nanotubes are superior to armchair nanotubes as nanowires, by modeling the metal-nanotube interface. More specifically, we show that as a function of coupling strength, the total electron transmission of armchair nanotubes increases and tends to be pinned close to unity for a metal with Fermi wave vector close to that of gold. In contrast, the total transmission of zigzag nanotubes increases to the maximum possible value of two. The origin of these effects lies in the details of the wave function, which is explained. © 2001 American Institute of Physics.


Related Articles

  • Fast current-induced domain-wall motion controlled by the Rashba effect. Miron, Ioan Mihai; Moore, Thomas; Szambolics, Helga; Buda-Prejbeanu, Liliana Daniela; Auffret, Stéphane; Rodmacq, Bernard; Pizzini, Stefania; Vogel, Jan; Bonfim, Marlio; Schuhl, Alain; Gaudin, Gilles // Nature Materials;Jun2011, Vol. 10 Issue 6, p419 

    The propagation of magnetic domain walls induced by spin-polarized currents has launched new concepts for memory and logic devices. A wave of studies focusing on permalloy (NiFe) nanowires has found evidence for high domain-wall velocities (100 m s−1; refs , ), but has also exposed the...

  • Vortex domain wall chirality rectification due to the interaction with end domain spin structures in permalloy nanowires. Wilhelm, E.-S.; McGrouther, D.; Heyne, L.; Bisig, A.; Kläui, M. // Applied Physics Letters;12/21/2009, Vol. 95 Issue 25, p252501 

    The interaction of vortex domain walls with the end domain spin structure present at the rectangular end of a ferromagnetic nanowire is investigated using Lorentz transmission electron microscopy. When vortex walls are moved with short field pulses towards the wire end an end vortex is formed,...

  • Chirality-dependent domain wall pinning in a multinotched planar nanowire and chirality preservation using transverse magnetic fields. Eastwood, D. S.; King, J. A.; Bogart, L. K.; Cramman, H.; Atkinson, D. // Journal of Applied Physics;Jan2011, Vol. 109 Issue 1, p013903 

    Chirality-dependent pinning of magnetic domain walls (DWs) has been observed in a planar Ni81Fe19 nanowire with two spatially separated notches on opposite edges of the wire. Using focused magneto-optical Kerr effect measurements of field-driven magnetization reversal we show that several...

  • Formation of chiral branched nanowires by the Eshelby Twist. Zhu, Jia; Peng, Hailin; Marshall, A. F.; Barnett, D. M.; Nix, W. D.; Cui, Yi // Nature Nanotechnology;Aug2008, Vol. 3 Issue 8, p477 

    Manipulating the morphology of inorganic nanostructures, such as their chirality and branching structure, has been actively pursued as a means of controlling their electrical, optical and mechanical properties. Notable examples of chiral inorganic nanostructures include carbon nanotubes, gold...

  • Scaling Behaviour of Chirality Dependent Domain Wall Pinning in Planar Nanowires. Eastwood, D. S.; Bogart, L. K.; Atkinson, D. // Acta Physica Polonica, A.;Nov2010, Vol. 118 Issue 5, p719 

    Micromagnetic modelling is used to establish the dimensional scaling dependence of the magnetic fields required for domain wall injection and chirality dependent pinning in planar permalloy nanowires with asymmetric structural notches. The wire width, thickness and notch constriction width are...

  • Characteristics of domain wall chirality and propagation in a Y-junction nanowire. Kwak, W.-Y.; Seungha Yoon; Kwon, J.-H.; Grünberg, P.; Cho, B. K. // Journal of Applied Physics;2016, Vol. 119 Issue 2, p023904-1 

    Chirality-dependent propagation of transverse wall along a nanowire was investigated using a Y-junction with spin-valve structure. It was found that the Y-junction can be used for convenient and effective electric detection of transverse domain wall chirality, especially in a nanowire with...

  • Observation of asymmetrical pinning of domain walls in notched Permalloy nanowires using electron holography. He, Kai; Smith, David J.; McCartney, Martha R. // Applied Physics Letters;11/2/2009, Vol. 95 Issue 18, p182507 

    Field-driven domain-wall motion and pinning in notched Permalloy nanowires have been observed using electron holography and Lorentz microscopy. Transverse domain walls (TDWs) were identified and different aspects of their behavior, including nucleation, injection, pinning, and depinning, were...

  • Controlled domain wall injection into ferromagnetic nanowires from an optimized pad geometry. McGrouther, D.; McVitie, S.; Chapman, J. N.; Gentils, A. // Applied Physics Letters;7/9/2007, Vol. 91 Issue 2, p022506 

    The authors present an improved geometry for a micron-scale pad for the injection of vortex domain walls (VDWs) into ferromagnetic nanowires. The pad supports a single vortex magnetization state, the chirality of which can be controlled simply by field saturation along a specific direction. We...

  • Domain wall trajectory determined by its fractional topological edge defects. Pushp, Aakash; Phung, Timothy; Rettner, Charles; Hughes, Brian P.; Yang, See-Hun; Thomas, Luc; Parkin, Stuart S. P. // Nature Physics;Aug2013, Vol. 9 Issue 8, p505 

    A domain wall (DW) in a ferromagnetic nanowire is composed of elementary topological bulk and edge defects with integer and fractional winding numbers, respectively, whose relative spatial arrangement determines the chirality of the DW. Here we show how we can understand and control the...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics