In‐Plane Heterostructures Enable Internal Stress Assisted Strain Engineering in 2D Materials

Abstract

Conventional methods to induce strain in 2D materials can hardly catch up with the sharp increase in requirements to design specific strain forms, such as the pseudomagnetic field proposed in graphene, funnel effect of excitons in MoS , and also the inverse funnel effect reported in black phosphorus. Therefore, a long-standing challenge in 2D materials strain engineering is to find a feasible scheme that can be used to design given strain forms. In this article, combining the ability of experimentally synthetizing in-plane heterostructures and elegant Eshelby inclusion theory, the possibility of designing strain fields in 2D materials to manipulate physical properties, which is called internal stress assisted strain engineering, is theoretically demonstrated. Particularly, through changing the inclusion's size, the stress or strain gradient can be controlled precisely, which is never achieved. By taking advantage of it, the pseudomagnetic field as well as the funnel effect can be accurately designed, which opens an avenue to practical applications for strain engineering in 2D materials.

Defect-Enabled Phase Programming of Transition Metal Dichalcogenide Monolayers

“…According to the theory of elasticity, regions close to holes or inclusions may be expected to act as preferred nucleation sites of 1T′ domains due to strain amplification. As predicted by the classic Eshelby solution and verified by molecular dynamics simulations of graphene, strains reach their maxima along the edges of the inclusions. Inspired by these observations, we consider arrays of circular holes of radii and separations R h and D h , respectively, under biaxial macroscopic tensile strain (i.e., and ), to test the feasibility of this phase programming strategy (cf.…”

Defects in Graphene/h-BN Planar Heterostructures: Insights into the Interfacial Thermal Transport Properties

“…The in-plane hybrid structure involves the seamless splicing of two or more different atomic monomolecular films together through covalent bonds [ 1 , 2 , 3 ]. The special connection mode may create many interesting thermal transport properties and contribute to the design of functional heterostructures [ 4 , 5 , 6 ].…”

Strain Engineering of Low‐Dimensional Materials for Emerging Quantum Phenomena and Functionalities

“…The authors used Eshelby inclusion theory calculations to design these shapes, and then verified some of them with experimental samples, finding deterministic methods to create uniform strain fields or precisely controlled strain gradients in the regions near the heterojunction. [51] Finally, in order to experimentally map 2D heterojunction lattices and strain profiles, Han et al developed a novel electron microscope pixel array detector (EMPAD) for high speed and high dynamic range investigations of in-plane heterostructures. The EMPAD is capable of simultaneously mapping lattice constant, strain, dislocations, and out-of-plane ripples at heterojunctions from a single scan.…”