• Influence of soliton distributions on the spin-dependent electronic transport through polyacetylene molecule

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    • Keywords


      Polyacetylene; soliton; spin-dependent current; tunnelling magnetoresistance.

    • Abstract


      In this paper, a detailed numerical study of the role of selected soliton distributions on the spin-dependent transport through {\it trans}-polyacetylene (PA) molecule is presented. The molecule is attached symmetrically to magnetic semi-infinite three-dimensional electrodes. Based on Su–Schrieffer–Heeger (SSH) Hamiltonian and using a generalized Green’s function formalism, wecalculate the spin-dependent currents, the electronic transmission and tunnelling magnetoresistance (TMR). We found that the presence of a uniform distribution of the soliton centres along the molecular chain reduced the size of the band gap of {\it trans}-PA molecule. Moreover, a sublattice of the correlated solitons as binary clusters, which are randomly distributed along the chain, can induce extended electronic states in the band gap of the molecule. In this case, the band gap of the molecule is suppressed and at lower voltages, the TMR bandwidth is narrowed. The current–voltage characteristic then shows an ohmic-like behaviour.

    • Author Affiliations


      Ketabi S A1 Nakhaee M1

      1. School of Physics, Damghan University, Damghan, Iran
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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