• Microscopic theory of substrate-induced gap effect on real AFM susceptibility in graphene

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      https://www.ias.ac.in/article/fulltext/pram/089/01/0016

    • Keywords

       

      Graphene; dynamic spin antiferromagnetic susceptibility; Coulomb interaction

    • Abstract

       

      We address here a tight-binding model study of frequency-dependent real part of antiferromagnetic susceptibility for the graphene systems. TheHamiltonian consists of electron hopping upto third nearest-neighbours,substrate and impurity effects in the presence of electron–electron interactions at A and B sublattices. To calculate susceptibility, we evaluate the two-particle electron Green’s function by using Zubarev’s Green’s functiontechnique. The frequency-dependent real part of antiferromagnetic susceptibility of the system is computed numerically by taking 1000 × 1000 grid points of the electron momentum. The susceptibility displays a sharp peak at the neutron momentum transfer energy at low energies and another higher energy peak appearing at substrate-induced gap. The evolution of these two peaks is investigated by varying neutron wave vector, Coulomb correlation energy, substrate-induced gap, electron hopping integrals and A- and B-site electron doping concentrations.

    • Author Affiliations

       

      SIVABRATA SAHU1 S K PANDA2 G C ROUT3

      1. School of Applied Sciences (Physics), Campus-3, KIIT University, Bhubaneswar 751 024, India
      2. K.D. Science College, Pochilima, Hinjilicut 761 101, India
      3. Condensed Matter Physics Group, Physics Enclave, Plot No. 664/4825, Lane-4A, Shree Vihar, Chandrasekharpur, Po-Patia, Bhubaneswar 751 031, India
    • Dates

       
  • Pramana – Journal of Physics | News

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