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<p>We study the electronic properties of monolayer and bilayer graphene in the presence of spin–orbit coupling and a staggered potential to investigate the tunability of the energy band spectrum. Detailed analyses are carried out for monolayer graphene with Rashba spin–orbit coupling (RSOC). By introducing RSOC in small increments, we observe the lifting of spin degeneracy in the energy bands. As the RSOC strength increases, we observe a direct consequence of spin-momentum locking, which is attributed to the breaking of inversion symmetry. Further, the band structure is modified when a staggered potential is applied in the presence of RSOC. The combined effect of RSOC and the staggered potential enhances spin splitting and spin polarization. We also investigate the deformation of the Fermi surface by mapping it using contour plots for finite strength of RSOC. Furthermore, we examine the energy band spectrum of bilayer graphene in the presence of RSOC and a staggered potential, focusing on its behavior in the vicinity of the Dirac points. These studies are helpful for the fabrication and modeling of graphene-based channels for spintronic devices.</p>

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Graphene Band Engineering for Spintronics Applications

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Akansha Thakur,
  • Niladri Sarkar

摘要

We study the electronic properties of monolayer and bilayer graphene in the presence of spin–orbit coupling and a staggered potential to investigate the tunability of the energy band spectrum. Detailed analyses are carried out for monolayer graphene with Rashba spin–orbit coupling (RSOC). By introducing RSOC in small increments, we observe the lifting of spin degeneracy in the energy bands. As the RSOC strength increases, we observe a direct consequence of spin-momentum locking, which is attributed to the breaking of inversion symmetry. Further, the band structure is modified when a staggered potential is applied in the presence of RSOC. The combined effect of RSOC and the staggered potential enhances spin splitting and spin polarization. We also investigate the deformation of the Fermi surface by mapping it using contour plots for finite strength of RSOC. Furthermore, we examine the energy band spectrum of bilayer graphene in the presence of RSOC and a staggered potential, focusing on its behavior in the vicinity of the Dirac points. These studies are helpful for the fabrication and modeling of graphene-based channels for spintronic devices.