Frustration and Atomic Ordering in a Monolayer Semiconductor Alloy

Azizi, Amin; Dogan, Mehmet; Cain, Jeffrey D.; Eskandari, Rahmatollah; Yu, Xuanze; Glazer, Emily C.; Cohen, Marvin L.; Zettl, Alex

doi:10.1103/physrevlett.124.096101

Title: Frustration and Atomic Ordering in a Monolayer Semiconductor Alloy

Journal Article · 05 March 2020 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.124.096101 · OSTI ID:1607414

^[1];

^[2];

^[2]; Eskandari, Rahmatollah ^[1]; Yu, Xuanze ^[1];

^[1]; Cohen, Marvin L. ^[2]; Zettl, Alex ^[2]

Univ. of California, Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Frustrated interactions can lead to short-range ordering arising from incompatible interactions of fundamental physical quantities with the underlying lattice. The simplest example is the triangular lattice of spins with antiferromagnetic interactions, where the nearest-neighbor spin-spin interactions cannot simultaneously be energy minimized. In this work, we show that engineering frustrated interactions is a possible route for controlling structural and electronic phenomena in semiconductor alloys. Using aberration-corrected scanning transmission electron microscopy in conjunction with density functional theory calculations, we demonstrate atomic ordering in a two-dimensional semiconductor alloy as a result of the competition between geometrical constraints and nearest-neighbor interactions. Statistical analyses uncover the presence of short-range ordering in the lattice. In addition, we show how the induced ordering can be used as another degree of freedom to considerably modify the band gap of monolayer semiconductor alloys.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1607414

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Frustration and Atomic Ordering in a Monolayer Semiconductor Alloy

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