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论文类型：期刊论文
发表时间：2008-09-01
发表刊物：APPLIED PHYSICS LETTERS
收录刊物：SCIE、EI、Scopus
卷号：93
期号：9
ISSN号：0003-6951
摘要：The physical origin of quantum-size effects (QSEs) and its impact on the decay length of electrons in Pb thin films are studied by first-principles calculations. We show that QSE is not only size but also wavevector dependent: being maximum at (Gamma) over bar due to strong interlayer coupling between p(z) orbitals, but could be vanishingly small at other symmetry points due to weak interlayer coupling between p(x,y) orbitals. The electron decay length also exhibits systematic oscillations with film thickness and the (Gamma) over bar valley has the slowest decay. (C) 2008 American Institute of Physics.