Ferromagnetism in chiral multilayer two-dimensional semimetals

Hongki Min, E. H. Hwang, and S. Das Sarma
Phys. Rev. B 95, 155414 – Published 10 April 2017

Abstract

We calculate the temperature-dependent long-range magnetic coupling in the presence of dilute concentrations of random magnetic impurities in chiral multilayer two-dimensional semimetals, i.e., undoped intrinsic multilayer graphene. Assuming a carrier-mediated indirect Ruderman-Kittel-Kasuya-Yosida exchange interaction among the well-separated magnetic impurities with the itinerant carriers mediating the magnetic interaction between the impurities, we investigate the magnetic properties of intrinsic multilayer graphene using an effective chiral Hamiltonian model. We find that due to the enhanced density of states in the rhombohedral stacking sequence of graphene layers, the magnetic ordering of multilayer graphene is ferromagnetic in the continuum limit. The ferromagnetic transition temperature is calculated using a finite-temperature self-consistent field approximation and found to be within the experimentally accessible range for reasonable values of the impurity-carrier coupling.

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  • Received 6 February 2017

DOI:https://doi.org/10.1103/PhysRevB.95.155414

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Hongki Min1,2, E. H. Hwang1,3, and S. Das Sarma1

  • 1Condensed Matter Theory Center and Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742-4111, USA
  • 2Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
  • 3SKKU Advanced Institute of Nanotechnology and Department of Physics, Sungkyunkwan University, Suwon 16419, Korea

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Vol. 95, Iss. 15 — 15 April 2017

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