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Related Concept Videos

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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Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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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.
If...
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Transformation of Plane Strain01:12

Transformation of Plane 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.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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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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Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

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Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Strain-modulated Ge superlattices.

Michele Virgilio1, Giuseppe Grosso

  • 1Dipartimento di Fisica 'E Fermi', Università di Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy. NEST, Istituto Nanoscienze-CNR, P.za San Silvestro 12, I-56127 Pisa, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 17, 2015
PubMed
Summary
This summary is machine-generated.

We show that strained germanium superlattices can be engineered to create novel optical devices. By controlling strain and periodicity, we can achieve direct-gap properties suitable for silicon-compatible photonics.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Optoelectronics

Background:

  • Germanium (Ge) is a crucial semiconductor material.
  • Strain engineering offers a pathway to tune semiconductor properties.
  • Superlattices provide a platform for novel electronic and optical functionalities.

Purpose of the Study:

  • To numerically investigate the electronic and optical properties of single-element germanium superlattices.
  • To explore the impact of applied strain on germanium band structure and optical characteristics.
  • To assess the potential of these superlattices for optoelectronic device applications.

Main Methods:

  • Utilizing the tight-binding model for electronic structure calculations.
  • Simulating periodic sequences of relaxed and strained germanium regions.
  • Analyzing superlattice band gaps, state confinement, and symmetry properties.

Main Results:

  • Strain-driven modifications to the band structure were evaluated.
  • Superlattices with tunable band gaps were identified.
  • Conditions for realizing type-I, direct-gap superlattices with strong optical transitions were determined.

Conclusions:

  • Single-element germanium strained superlattices can be designed for specific optical properties.
  • These engineered germanium superlattices show promise for silicon-compatible optical devices.
  • The study demonstrates a viable route for creating novel optoelectronic materials using strain engineering.