Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Si(111) strained layers on Ge(111): evidence for c(2x4) domains   The tensile strained Si(111) layers grown on top of Ge(111) substrates are
studied by combining scanning tunneling microscopy, low energy electron
diffraction and first-principles calculations. It is shown that the layers
exhibit c(2x4) domains, which are separated by domain walls along <-110>
directions. A model structure for the c(2x4) domains is proposed, which shows
low formation energy and good agreement with the experimental data. The results
of our calculations suggest that Ge atoms are likely to replace Si atoms with
dangling bonds on the surface (rest-atoms and adatoms), thus significantly
lowering the surface energy and inducing the formation of domain walls. The
experiments and calculations demonstrate that when surface strain changes from
compressive to tensile, the (111) reconstruction converts from
dimer-adatom-stacking fault-based to adatom-based structures.

36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph