Journal
PHYSICAL REVIEW B
Volume 94, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.035304
Keywords
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Funding
- Physics and Mechanical Engineering Departments at Boston University
- Materials Science and Engineering Innovation Grant
- Boston University High Performance Shared Computing Cluster
- National Research Foundation, Prime Minister Office, Singapore [R-144-000-295-281]
- NSF Grant [PHY-1066293]
- Mechanical Engineering Department at Boston University
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Group-IV monochalcogenides are a family of two-dimensional puckered materials with an orthorhombic structure that is comprised of polar layers. In this article, we use first principles calculations to show the multistability of monolayer SnS and GeSe, two prototype materials where the direction of the puckering can be switched by application of tensile stress or electric field. Furthermore, the two inequivalent valleys in momentum space, which are dictated by the puckering orientation, can be excited selectively using linearly polarized light, and this provides an additional tool to identify the polarization direction. Our findings suggest that SnS and GeSe monolayers may have observable ferroelectricity and multistability, with potential applications in information storage.
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