Abstract
We demonstrate that the well-known 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.
- Received 16 October 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.4895
©1998 American Physical Society