Tunneling of Bloch electrons through vacuum barrier

Details Tunneling of Bloch electrons through vacuum barrier Tunneling of Bloch electrons through vacuum barrier

2000-12-04

arxiv.org/abs/cond-mat/0012049v1

Europhys. Lett., 55, 404, 2001

Physics

Condensed Matter

Materials Science

4 pages, no figs

Scientific paper

10.1209/epl/i2001-00414-0

Tunneling of Bloch electrons through a vacuum barrier introduces new physical effects in comparison with the textbook case of free (plane wave) electrons. For the latter, the exponential decay rate in the vacuum is minimal for electrons with the parallel component of momentum ${\bf k}_\parallel=0$, and the prefactor is defined by the electron momentum component in the normal to the surface direction. However, the decay rate of Bloch electrons may be minimal at an arbitrary ${\bf k}_\parallel$ (``hot spots''), and the prefactor is determined by the electron's group velocity, rather than by its quasimomentum.

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