Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic band structure of ultimately thin silicon oxide on Ru(0001)   Silicon oxide can be formed in a crystalline form, when prepared on a
metallic substrate. It is a candidate support catalyst and possibly the
ultimately-thin version of a dielectric host material for two-dimensional
materials (2D) and heterostructures. We determine the atomic structure and
chemical bonding of the ultimately thin version of the oxide, epitaxially grown
on Ru(0001). In particular, we establish the existence of two sub-lattices
defined by metal-oxygen-silicon bridges involving inequivalent substrate sites.
We further discover four electronic bands below Fermi level, at high binding
energies, two of them forming a Dirac cone at K point, and two others forming
semi-flat bands. While the latter two correspond to hybridized states between
the oxide and the metal, the former relate to the topmost silicon-oxygen plane,
which is not directly coupled to the substrate. Our analysis is based on high
resolution X-ray photoelectron spectroscopy, angle-resolved photoemission
spectroscopy, scanning tunneling microscopy, and density functional theory
calculations.

17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
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The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph