Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Imaging the buried MgO/Ag interface: formation mechanism of the STM
  contrast   Scanning tunneling microscopy (STM) provides real-space electronic state
information at the atomic scale that is most commonly used to study materials
surfaces. An intriguing extension of the method is attempt to study the
electronic structure at an insulator/conductor interface by performing low-bias
imaging above the surface of an ultrathin insulating layer on the conducting
substrate. We use first-principles theory to examine the physical mechanisms
giving rise to the formation of low-bias STM images in the MgO/Ag system. We
show that the main features of the low-bias STM contrast are completely
determined by the atoms on the surface of MgO. Hence, the low-bias contrast is
formed by states at the Fermi level in the Ag that propagate evanescently
through the lattice and atomic orbitals of the MgO on their way to the surface.
We develop a number of analysis techniques based on an ab initio tight-binding
representation that allow identification of the origin of the STM contrast in
cases where previous approaches have proven ambiguous.

24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex