Evolution of elastic moduli through a two-dimensional structural transformation
- Univ. Tecnica Federico Santa Maria, Valparaiso (Chile)
- Univ. of Arkansas, Fayetteville, AR (United States)
We use a classical analytical and separable elastic energy landscape describing SnO monolayers to estimate the softening of elastic moduli through a mechanical instability occurring at finite temperature in this material. Although not strictly applicable to this material due to its low-energy barrier J that leads to a quantum paraelastic phase, the present exercise is relevant as it establishes a conceptual procedure to estimate such moduli straight from a two-dimensional elastic energy landscape. As additional support for the existence of a quantum paraelastic phase, we carry a qualitative WKB analysis to estimate escape times from an individual well on the landscape; escape times increase exponentially with the height of the barrier J. We also provide arguments against an additional transformation onto a planar lattice due to its high-energy cost. These results continue to establish a case for the usefulness of soft matter concepts in two-dimensional materials, and of the potential lurking of quantum effects into soft matter.
- Research Organization:
- Univ. of Arkansas, Fayetteville, AR (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)
- Grant/Contract Number:
- SC0016139; AC02-06CH11357; DMR-1610126
- OSTI ID:
- 1612403
- Journal Information:
- Physical Review B, Vol. 99, Issue 10; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Toward Quantum Paraelectric, Paraelastic, and Paramagnetic 2D Materials
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journal | December 2019 |
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