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Title: Evolution of elastic moduli through a two-dimensional structural transformation

Journal Article · · Physical Review B
 [1];  [2];  [2];  [2];  [2]
  1. Univ. Tecnica Federico Santa Maria, Valparaiso (Chile)
  2. 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
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Cited By (1)

Toward Quantum Paraelectric, Paraelastic, and Paramagnetic 2D Materials journal December 2019