Colloquium: Physical properties of group-IV monochalcogenide monolayers

Barraza-Lopez, Salvador; Fregoso, Benjamin M.; Villanova, John W.; Parkin, Stuart S. P.; Chang, Kai

doi:10.1103/revmodphys.93.011001

Title: Colloquium: Physical properties of group-IV monochalcogenide monolayers

Journal Article · Wed Mar 10 00:00:00 EST 2021 · Reviews of Modern Physics

DOI:https://doi.org/10.1103/revmodphys.93.011001· OSTI ID:1770290

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Univ. of Arkansas, Fayetteville, AR (United States)
Kent State Univ., Kent, OH (United States)
Max Planck Inst. of Microstructure Physics, Halle (Germany)
Beijing Academy of Quantum Information Sciences (China)

The state-of-the-art knowledge of ferroelectric and ferroelastic group-IV monochalcogenide monolayers is surveyed. These semiconductors feature remarkable structural and mechanical properties, such as a switchable in-plane spontaneous polarization, soft elastic constants, structural degeneracies, and thermally driven two-dimensional structural transformations. Additionally, these 2D materials display selective valley excitations, valley Hall effects, and persistent spin helix behavior. After a description of their Raman spectra, a discussion of optical properties arising from their lack of centrosymmetry (such as an unusually strong second-harmonic intensity, large bulk photovoltaic effects, photostriction, and tunable exciton binding energies) is provided as well. Here, the physical properties observed in these materials originate from (correlate with) their intrinsic and switchable electric polarization, and the physical behavior hereby reviewed could be of use in nonvolatile memory, valleytronic, spintronic, and optoelectronic devices: these 2D multiferroics enrich and diversify the 2D material toolbox.

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Research Organization:: Univ. of Arkansas, Fayetteville, AR (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0016139; DMR-2015639; AC02-05CH11231; 0722625; 0959124; 0963249; 0918970

OSTI ID:: 1770290

Journal Information:: Reviews of Modern Physics, Vol. 93, Issue 1; ISSN 0034-6861

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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