Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrostatic Field Driven Alignment of Organic Oligomers on ZnO
  Surfaces   We study the physisorption of organic oligomers on the ZnO($10\bar{1}0$)
surface using first-principles density-functional theory and non-empirical
embedding methods. We find that both in-plane location and orientation of the
molecules are completely determined by the coupling of their quadrupole moments
to the periodic dipolar electric field present at the semiconductor surface.
The adsorption is associated with the formation of a molecular dipole moment
perpendicular to the surface, which bears an unexpected linear relation to the
molecule-substrate interaction energy. Long oligomers such as sexiphenyl become
well-aligned with stabilization energies of several 100 meV along rows of
positive electric field, in full agreement with recent experiments. These
findings define a new route towards the realization of highly-ordered
self-assembled arrays of oligomers/polymers on ZnO($10\bar{1}0$) and similar
surfaces.

29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat