How could change the energy band gap(E-K) using the strain?

In summary, the conversation discusses the relationship between strain and energy band structure. With tensile strain, the energy band structure is changed resulting in a decrease in the band gap. On the other hand, with compressive strain, the energy band structure is also changed, but the band gap increases. The reason for this change is not clear and requires further explanation. A reference is requested for more information on this topic, specifically a mainstream textbook or peer-reviewed journal article. The conversation also mentions the use of Raman strain measurement and energy band structure in Germanium.
  • #1
SungDae
4
0
Hi! I'm sung dae

with tensile strain, energy band structure could be changed. bang gap decrease
with compressive strain, energy band structure could be changed. bang gap increase

but I'm not sure why it could be changed ..

Is there someone who explain in detail ?

thanks. have a nice day! :)
 
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  • #2
SungDae said:
Hi! I'm sung dae

with tensile strain, energy band structure could be changed. bang gap decrease
with compressive strain, energy band structure could be changed. bang gap increase

but I'm not sure why it could be changed ..

Is there someone who explain in detail ?

thanks. have a nice day! :)

Do you have a reference for that? Please post a mainstream textbook or peer-reviewed journal article that addresses your claims. Thanks.
 
  • #3

1. What is the relationship between strain and the energy band gap?

The energy band gap is directly affected by the strain applied to a material. As strain is applied, the crystal lattice of the material is distorted, causing a change in the energy levels of the electrons within the material's band structure. This change in energy levels results in a change in the band gap.

2. How does compressive strain affect the energy band gap?

Compressive strain, which occurs when a material is squeezed or compressed, causes the energy band gap to decrease. This is because the crystal lattice is compressed, causing the energy levels of the electrons to increase and thus reducing the band gap.

3. What happens to the energy band gap under tensile strain?

Tensile strain, which occurs when a material is stretched or pulled, causes the energy band gap to increase. This is because the crystal lattice is stretched, decreasing the energy levels of the electrons and widening the band gap.

4. Can the energy band gap be adjusted by changing the type of strain applied?

Yes, both compressive and tensile strain can be used to adjust the energy band gap, depending on the desired outcome. Compressive strain can decrease the band gap, while tensile strain can increase it. The type of strain applied depends on the material and its band structure.

5. Is there a limit to how much the energy band gap can be changed using strain?

Yes, there is a limit to how much the energy band gap can be changed using strain. This limit is determined by the material's band structure and its ability to withstand strain without permanently damaging the crystal lattice. Exceeding this limit can result in changes to the material's properties, such as its conductivity and optical properties.

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