Topological Insulator: A Zero-Gap Material With SOC?

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SUMMARY

The discussion centers on the characteristics of topological insulators (TIs) and their relationship with spin-orbit coupling (SOC). It is established that materials can exhibit a zero band gap without SOC, but applying SOC can open a small gap of approximately 0.1 eV, transforming them into TIs. The inquiry posed is whether a material with a larger band gap of 1 eV can also become a topological insulator through the application of SOC. The consensus indicates that the effectiveness of SOC in creating a larger gap depends significantly on the strength of the spin-orbit interaction, often necessitating the presence of heavy elements like bismuth.

PREREQUISITES
  • Understanding of topological insulators (TIs)
  • Knowledge of spin-orbit coupling (SOC)
  • Familiarity with band gap concepts in solid-state physics
  • Awareness of materials science, particularly heavy elements like bismuth
NEXT STEPS
  • Research the properties of spin-orbit coupling in materials
  • Explore the role of heavy elements in enhancing SOC
  • Investigate the theoretical frameworks for large band gap materials
  • Examine recent studies on topological insulators and their applications
USEFUL FOR

Physicists, materials scientists, and researchers focused on condensed matter physics, particularly those studying topological insulators and spin-orbit coupling effects.

mohsen2002
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Hi every one,

I face with a question on my works,
As you know there in many articles Physicist introduce a material that has zero gap without spin-orbit coupling (SOC). By applying the SOC, a relatively small gap (0.1 eV) is opened and it becomes topological insulator.
My question,
Is that possible to have a material that has a large band gap (1 eV) without SOC and it becomes topological insulator with large gap by applying SOC?

Thanks for your answers,
 
Physics news on Phys.org
It depends on the value of spin orbit relative to the gap. The reason most TIs contain bismuth or another heavy element is because you need really strong spin orbit.
 

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