Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interorbital charge transfers and Fermi-surface deformations in strongly
  correlated metals: models, BaVS$_3$ and Na$_{x}$CoO$_2$   Fermi-surface deformations in strongly correlated metals, in comparison to
results from band-structure calculations, are investigated. We show that
correlation-induced interband charge transfers in multi-orbital systems may
give rise to substantial modifications of the actual Fermi surface. Depending
in particular on the relative strength of the crystal-field splitting and of
the Hund's exchange coupling, correlations may either reinforce orbital
polarization or tend to compensate differences in orbital occupancies, as
demonstrated by investigating a 2-band Hubbard model in the framework of
dynamical mean field theory (DMFT). The physical implications of such
interorbital charge transfers are then explored in two case studies: BaVS$_3$
and Na$_x$CoO$_2$. By means of the DMFT in combination with the local density
approximation (LDA) to density functional theory (DFT), new insights in the
underlying mechanism of the metal-to-insulator transition (MIT) of BaVS$_3$ are
obtained. A strong charge redistribution in comparison to LDA calculations,
i.e., a depletion of the broader $A_{1g}$ band in favor of the narrower $E_g$
bands just above the MIT is found. In addition, the intriguing problem of
determining the Fermi surface in the strongly correlated cobaltate system
Na$_{x}$CoO$_2$ is discussed.

29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga