Work

Multiferroic Two-Dimensional Materials

Year: 2016

Type: article

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 α-SnO monolayer as a prototype. Such a band edge causes a van Hove singularity diverging with 1/sqrt[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, α-SnO, 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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.116.206803

Authors: L. Seixas, A. S. Rodin, A. Carvalho, A. H. Castro Neto

Institutions: National University of Singapore, Universidade Presbiteriana Mackenzie

Language: English

Topic: Multiferroics and related materials

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funder: National Research Foundation

Award: G2690809270