Reduction of amplitude and wavelength of Friedel oscillation on Na(111) surface

Abstract

First-principles calculations have been conducted on the (110), (100), and (111) surfaces of bcc sodium to study the behavior of Friedel oscillations near real surfaces. It has been found that on the open Na(111) surface, both the amplitude and wavelength of the Friedel oscillation in the region near the surface are noticeably reduced compared with the close-packed Na(110) surface. This shows that the surface orientation and the local atomic structure near the defect have a considerable effect on the Friedel oscillations. © 2005 The American Physical Society.