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Related Concept Videos

Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
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Tuning quantum electron and phonon transport in two-dimensional materials by strain engineering: a Green's function

Leonardo Medrano Sandonas1, Rafael Gutierrez2, Alessandro Pecchia3

  • 1Institute for Materials Science and Max Bergmann Center of Biomaterials, TU Dresden, 01062 Dresden, Germany. rafael.gutierrez@nano.tu-dresden.de and Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany.

Physical Chemistry Chemical Physics : PCCP
|December 17, 2016
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Summary

Strain engineering of two-dimensional (2D) materials like hBN, phosphorene, and MoS2 significantly alters their electronic and thermal transport properties. Tailoring strain in contacts and devices offers tunable control for nanoelectronic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials possess unique physical properties.
  • Strain engineering is a promising technique for tuning material properties.
  • Transport properties of 2D materials are highly sensitive to applied strain.

Purpose of the Study:

  • To investigate the impact of strain engineering on electron and phonon transport in 2D materials.
  • To analyze the effects of strain on hexagonal boron-nitride (hBN), phosphorene, and MoS2 monolayers.
  • To explore how strain in contact and device regions influences transport characteristics.

Main Methods:

  • Utilized a density-functional based tight-binding (DFTB) method.
  • Employed Green's function (GF) approaches for transport calculations.
  • Simulated strained and unstrained transport setups, including contact-device-contact regions.

Main Results:

  • Anomalous electronic bandgap behavior and decreasing thermal conductance observed with strain in the scattering region (unstretched contacts).
  • Homogeneous strain induced varying bandgap responses: decreases for hBN and MoS2, increases then saturates to zero for phosphorene.
  • Distinct strain-dependent thermal conductance observed for each material, tunable via contact strain.

Conclusions:

  • Strain engineering offers a powerful method to control electronic and thermal transport in 2D materials.
  • The specific response to strain is material-dependent, allowing for tailored applications.
  • Modulating strain in contact regions provides an additional control parameter for device optimization.