Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Excitation spectra of transition metal atoms on the Ag (100) surface
  controlled by Hund's exchange   We report photoemission experiments revealing the valence electron spectral
function of Mn, Fe, Co and Ni atoms on the Ag(100) surface. The series of
spectra shows splittings of higher energy features which decrease with the
filling of the 3d shell and a highly non-monotonous evolution of spectral
weight near the Fermi edge. First principles calculations demonstrate that two
manifestations of Hund's exchange $J$ are responsible for this evolution.
First, there is a monotonous reduction of the effective exchange splittings
with increasing filling of the 3d shell. Second, the amount of charge
fluctuations and, thus, the weight of quasiparticle peaks at the Fermi level
varies non-monotonously through this 3d series due to a distinct occupancy
dependence of effective charging energies $U_{\rm eff}$.

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The categories of this paper are: chem-ph
2
The categories of this paper are: math
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph