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  1. Josephson current through randomly oriented CNTs

Josephson current through randomly oriented CNTs

Faraei, Z ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.physc.2011.05.243
  3. Publisher: 2011
  4. Abstract:
  5. In this paper, we employ tunneling Hamiltonian formulation to obtain analytical expression for the Josephson current in (n, m) Carbon nanotubes (CNT) sandwiched between s-wave superconductors. For metallic tubes, we find that the dominant contribution to the Josephson current arises from modes crossing the Dirac points. Contribution from such conducting channels is independent of tube diameter of carbon nanotubes. Josephson current for each CNT is determined in terms of the spacing d between the superconductors, and the angle between the tube axis and the vector normal to the interface. Averaging over orientation angles gives the Josephson current through an assembly of randomly oriented CNTs, which turns out to be on the scale of 100 nA
  6. Keywords:
  7. Analytical expressions ; Conducting channels ; Conduction channel ; Dirac point ; Dominant contributions ; Josephson current ; Metallic tubes ; Orientation angles ; S-CNT-S junctions ; Tube diameters ; Tunneling Hamiltonian ; Carbon nanotubes ; Superconducting materials ; Superconductivity ; Josephson junction devices
  8. Source: Physica C: Superconductivity and its Applications ; Volume 471, Issue 15-16 , August , 2011 , Pages 458-462 ; 09214534 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921453411003303