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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


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    Science Advisor
    Education Advisor

    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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