Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.206803
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Funding
- National Research Foundation, Prime Minister Office, Singapore, under CRP award Novel 2D materials with tailored properties: Beyond graphene [R-144-000-295-281]
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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 alpha-SnO monolayer as a prototype. Such a band edge causes a van Hove singularity diverging with 1/root 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, alpha-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.
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