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Topological insulator

  1. Oct 2, 2015 #1
    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,
     
  2. jcsd
  3. Oct 4, 2015 #2

    radium

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    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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