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Does tunneling transmission probability depend on the density of states or velocity?

  1. Sep 28, 2014 #1
    In some quantum text books [1], the tunneling transmission formula depends only on the density of states of 2 regions (DOS) involved in tunneling. (T(E)=C×DOS1(E)×DOS2(E), where C is constant). However, in Landauer transmission formula (without tunneling) the transmission depends on both DOS and velocity of carriers (T(E)=C′×DOS(E)×v). So I am wondering if velocity is important too? If yes, which velocity in which region?!

    [1] For example, see "Introduction to Many-body quantum theory in condensed matter physics", Bruus et al.
  2. jcsd
  3. Sep 29, 2014 #2


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    The velocity comes in in the form of the kinetic energy of the tunneling particle. So it is explicitly a factor in any tunneling probability for a finite potential.

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