AVS 46th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS1-WeM

Paper SS1-WeM7
Alkali-Metal-induced 3x1 Reconstruction of the Ge(111) Surface

Wednesday, October 27, 1999, 10:20 am, Room 606

Session: Surface Structure
Presenter: G.S. Lee, Korea Research Institute of Standards and Science
Authors: G.S. Lee, Korea Research Institute of Standards and Science
J. Kim, Korea Advanced Institute of Science and Technologies
I. Chizhov, The Pennsylvania State University
H. Mai, The Pennsylvania State University
R.F. Willis, The Pennsylvania State University
Correspondent: Click to Email
We present the scanning tunneling microscopy (STM) images of the 3x1 reconstruction of the Ge(111) surface induced by the adsorption of Na and Li. Both filled- and empty-state images of Ge(111)3x1-Na consist of double-row zigzag chains. For Ge(111)3x1-Li, the filled-state image shows single-width rows with sparsely distributed block features between the rows, while the empty-state image is characterized by double rows of dimer-like features. For both surfaces, the dual-polarity images taken simultaneously reveal lateral shift and phase reversal of the rows upon polarity reversal. The apparent dissimilarity of the STM images is contradictory to the expectation that the Ge(111)3x1 surface, like the Si(111)3x1 surface, is a substrate reconstruction which is not specific to the kind of alkali metals. The interpretation of the images of both Ge(111)3x1 surfaces will be discussed by comparing with those of the Si(111)3x1 surfaces, and the recently proposed structural model for the Si(111)3x1 reconstruction.