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Why is the conductance quantized?

  1. Mar 8, 2014 #1
    according to the Landauer formula, the conductance is proportional to the transmission probability.

    But the transmission probability is not quantized generally

    So why is the conductance quantized?
  2. jcsd
  3. Mar 8, 2014 #2


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  4. Mar 8, 2014 #3
    i now see.

    So it is not as specular as magnetic quantization in superconductors
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