Dataset Information

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO₂ single crystals.

ABSTRACT: In-plane anisotropy (IPA) due to asymmetry in lattice structures provides an additional parameter for the precise tuning of characteristic polarization-dependent properties in two-dimensional (2D) materials, but the narrow range within which such method can modulate properties hinders significant development of related devices. Herein we present a novel periodic phase engineering strategy that can remarkably enhance the intrinsic IPA obtainable from minor variations in asymmetric structures. By introducing alternant monoclinic and rutile phases in 2D VO₂ single crystals through the regulation of interfacial thermal strain, the IPA in electrical conductivity can be reversibly modulated in a range spanning two orders of magnitude, reaching an unprecedented IPA of 113. Such an intriguing local phase engineering in 2D materials can be well depicted and predicted by a theoretical model consisting of phase transformation, thermal expansion, and friction force at the interface, creating a framework applicable to other 2D materials. Ultimately, the considerable adjustability and reversibility of the presented strategy provide opportunities for future polarization-dependent photoelectric and optoelectronic devices.

SUBMITTER: Ran M

PROVIDER: S-EPMC11197522 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature

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Publications

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO<sub>2</sub> single crystals.

Ran Meng M Zhao Chao C Xu Xiang X Kong Xiao X Lee Younghee Y Cui Wenjun W Hu Zhi-Yi ZY Roxas Alexander A Luo Zhengtang Z Li Huiqiao H Ding Feng F Gan Lin L Zhai Tianyou T

Fundamental research 20211126 3

In-plane anisotropy (IPA) due to asymmetry in lattice structures provides an additional parameter for the precise tuning of characteristic polarization-dependent properties in two-dimensional (2D) materials, but the narrow range within which such method can modulate properties hinders significant development of related devices. Herein we present a novel periodic phase engineering strategy that can remarkably enhance the intrinsic IPA obtainable from minor variations in asymmetric structures. By ...[more]

PMID: 38933399

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Project description:We re-examine the internal structure of bimerons, which are stabilized in easy-plane chiral magnets and represent coupled states of two merons with the same topological charge |1/2| but with opposite vorticity and the polarity. We find that, in addition to the vortices and antivortices, bimerons feature circular regions which are located behind the anti-vortices and bear the rotational sense opposite to the rotational sense chosen by the Dzyaloshinskii-Moriya interaction. In an attempt to eliminate these wrong-twist regions with an excess of positive energy density, bimerons assemble into chains, and as such exhibit an attracting interaction potential. As an alternative to chains, we demonstrate the existence of ring-shaped bimeron clusters of several varieties. In some rings, bimeron dipoles are oriented along the circle and swirl clockwise and/or counterclockwise (dubbed "roundabouts"). Moreover, a central meron encircled by the outer bimerons may possess either positive or negative polarity. In other rings, the bimeron dipoles point towards the center of a ring and consequently couple to the central meron (dubbed "crossings"). We point out that the ringlike solutions for baryons obtained within the Skyrme model of pions, although driven by the same tendency of the energy reduction, yield only one type of bimeron rings. The conditions of stability applied to the described bimeron rings are additionally extended to bimeron networks when bimerons fill the whole space of two-dimensional samples and exhibit combinations of rings and chains dispersed with different spatial density (dubbed bimeron "polymers"). In particular, bimeron crystals with hexagonal and the square bimeron orderings are possible when the sides of the unit cells represent chains of bimerons joined in intersections with three or four bimerons, respectively; otherwise, bimeron networks represent disordered bimeron structures. Moreover, we scrutinize the inter-transformations between hexagonal Skyrmion lattices and disordered bimeron polymers occuring via nucleation and mutual annihilation of merons within the cell boundaries. Our theory provides clear directions for experimental studies of bimeron orderings in different condensed-matter systems with quasi-two-dimensional geometries.

Dataset Information

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO₂ single crystals.

Publications

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO<sub>2</sub> single crystals.

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Dataset Information

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO2 single crystals.

Publications

Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO<sub>2</sub> single crystals.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Boosting in-plane anisotropy by periodic phase engineering in two-dimensional VO₂ single crystals.