Multiferroic Two-Dimensional Materials

L. Seixas, A. S. Rodin, A. Carvalho, and A. H. Castro Neto
Phys. Rev. Lett. 116, 206803 – Published 20 May 2016
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Abstract

The relation between unusual Mexican-hat band dispersion, ferromagnetism, and ferroelasticity is investigated using a combination of analytical, first-principles, and phenomenological methods. The class of material with Mexican-hat band edge is studied using the αSnO monolayer as a prototype. Such a band edge causes a van Hove singularity diverging with 1/E, and a charge doping in these bands can lead to time-reversal symmetry breaking. Herein, we show that a material with Mexican-hat band dispersion, αSnO, can be ferroelastic or paraelastic depending on the number of layers. Also, an unexpected multiferroic phase is obtained in a range of hole density for which the material presents ferromagnetism and ferroelasticity simultaneously.

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  • Received 30 October 2015

DOI:https://doi.org/10.1103/PhysRevLett.116.206803

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

L. Seixas1,2,*, A. S. Rodin1, A. Carvalho1, and A. H. Castro Neto1

  • 1Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117542, Singapore
  • 2MackGraphe—Graphene and Nanomaterials Research Center, Mackenzie Presbyterian University, 01302-907 São Paulo, São Paulo, Brazil

  • *leandro.seixas@mackenzie.br

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Issue

Vol. 116, Iss. 20 — 20 May 2016

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