Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution from $B_{2g}$ nematics to $B_{1g}$ nematics in heavily
  hole-doped iron-based superconductors   Recent experiments reported an unusual nematic behavior of heavily hole-doped
pnictides $A$Fe$_{2}$As$_{2}$, with alkali $A$ = Rb, Cs. In contrast to the
$B_{2g}$ nematic order of the parent $Ae$Fe$_{2}$As$_{2}$ compounds (with
alkaline earth $Ae$ = Sr, Ba), characterized by unequal nearest-neighbor Fe-Fe
bonds, in the hole-doped systems nematic order is observed in the $B_{1g}$
channel, characterized by unequal next-nearest-neighbor Fe-Fe (diagonal
Fe-As-Fe) bonds. In this work, using density functional theory, we attribute
this behavior to the evolution of the magnetic ground state along the series
$Ae_{1-x}A_{x}$Fe$_{2}$As$_{2}$, from single stripes for small $x$ to double
stripes for large $x$. Our simulations using the reduced Stoner theory show
that fluctuations of Fe moments are essential for the stability of the
double-stripe configuration. We propose that the change in the nature of the
magnetic ground state is responsible for the change in the symmetry of the
vestigial nematic order that it supports.

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The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
17
The categories of this paper are: q-fin