Underbarrier interference |
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Authors: | B Ivlev |
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Institution: | Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico |
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Abstract: | 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. |
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Keywords: | Tunneling Interference Impurity |
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