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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.8K
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...
2.8K
Shearing Strain01:20

Shearing Strain

1.8K
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...
1.8K
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

600
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...
600
Stress-Strain Diagram01:10

Stress-Strain Diagram

5.9K
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
5.9K
Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

688
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...
688
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

725
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...
725

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Analysis of Contact Interfaces for Single GaN Nanowire Devices
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Quantifying Strain and Its Effect on Charge Transport in Ge/Si Core/Shell Nanowires.

Aswathi K Sivan1, Nicolas Forrer1, Aakash Shandilya1

  • 1Department of Physics, University of Basel, Basel, Switzerland.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 28, 2026
PubMed
Summary
This summary is machine-generated.

Strain engineering in Germanium/Silicon core/shell nanowires (CS NWs) optimizes properties for quantum technologies. This research achieved record hole mobility, paving the way for high-fidelity spin qubits.

Keywords:
Raman spectroscopycore–shell nanowiresgeometric phase analysisgermaniumhole mobilitysiliconstrain

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Area of Science:

  • Semiconductor Nanostructures
  • Quantum Technologies
  • Materials Science

Background:

  • Strain engineering is crucial for optimizing semiconductor nanostructures for quantum applications.
  • Germanium/Silicon core/shell nanowires (Ge/Si CS NWs) are promising platforms for spin qubits.
  • Controlling strain distribution within these nanowires is key to enhancing their performance.

Purpose of the Study:

  • To investigate the relationship between core and shell thicknesses and strain distribution in Ge/Si CS NWs.
  • To understand how geometry influences strain for optimizing spin qubit host properties.
  • To provide design guidelines for scalable quantum device architectures.

Main Methods:

  • Synthesis of Ge/Si CS NWs using Au-catalyzed chemical vapor deposition.
  • Characterization via High-Resolution Transmission Electron Microscopy (HRTEM) and elemental mapping.
  • Strain analysis using Geometric Phase Analysis (GPA), Raman spectroscopy, and polarization-resolved µ-Raman measurements.
  • Evaluation of electronic transport properties through hole mobility measurements.

Main Results:

  • Controlled synthesis of Ge/Si CS NWs with tunable dimensions.
  • Quantitative analysis of strain variations based on core and shell thicknesses.
  • Measurement of phonon mode splitting correlated with strain in the Ge core.
  • Achieved a record high hole mobility of 25,400 cm² V⁻¹ s⁻¹.

Conclusions:

  • Geometric parameters critically influence strain tuning in Ge/Si CS NWs.
  • Optimized Ge/Si CS NW structures demonstrate significant potential for high-fidelity spin qubits.
  • Findings offer valuable design insights for scalable quantum computing architectures.