Phys. Rev. Lett. 80, 4895–4898 (1998)Imaging Buried Interfacial Lattices with Quantized Electrons
See accompanying Physics Focus We demonstrate that the well-known Si(111)-(7×7) superlattice buried under as much as 100 Å of crystalline Pb can be directly imaged with a scanning tunneling microscope at 77 K. The unexpected transparency of the metal and the high lateral resolution are the result of a nondiffractive scattering of the electrons at the interface. We attribute this phenomenon to a large anisotropy of the effective masses associated with the free in-plane and the quantized transverse motion of the electrons. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.4895
DOI:
10.1103/PhysRevLett.80.4895
PACS:
61.16.Ch, 71.18.+y, 73.20.Dx, 79.60.Jv
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