Quantum size effect in Pb(100) films: the role of symmetry and implication for film growth

Details Quantum size effect in Pb(100) films: the role of symmetry and implication for film growth Quantum size effect in Pb(100) films: the role of symmetry and implication for film growth

2005-11-08

arxiv.org/abs/cond-mat/0511211v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.74.113401

We show from density-functional calculations that Pb(100) thin films exhibit quantum size effect with a bilayer periodicity in film energies, film relaxations, and work functions, which originate from different symmetry of the stacking geometry of odd and even layer films. The bilayer periodicity of the film energy is argued to survive on a semiconductor substrate, which should allow the growth of ``magically'' thick even-layer Pb(100) films. Furthermore, it is found that the quantum well states in a simple metal film can be classified into $\sigma$-bonded and $\pi$-bonded states, which quantize independently.

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