UNDERBARRIER INTERFERENCE

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Date/Time:Thursday, 28 Apr 2011 - Saturday, 30 Apr 2011
Location:PHYS ROOM 5
Phone:515-294-5630
Channel:Condensed Matter Physics
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Prof. Boris Ivlev

University of San Luis Potosi (Mexico)

Quantum tunneling through a two-dimensional static barrier becomes unusual when a momentum of an electron has a tangent component with respect to a border of the prebarrier region. If the barrier is not homogeneous in the direction perpendicular to tunneling a fraction of the electron state is waves propagating away from the barrier.

When the tangent momentum is zero a mutual interference of the waves results in an exponentially small outgoing flux. The finite tangent momentum destroys the interference due to formation of caustics by the waves. As a result, a significant fraction of the prebarrier density is carried away from the barrier providing a not exponentially small penetration even through an almost classical barrier. The total electron energy is well below the barrier.



B. Ivlev, Annals of Physics, 326, 979 (2011)