Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Increased hole mobility in anti-ThCr$_2$Si$_2$-type La$_2$O$_2$Bi
  co-sintered with alkaline earth metal oxides for oxygen intercalation and
  hole carrier doping   Metallic anti-ThCr$_2$Si$_2$-type $RE_2$O$_2$Bi ($RE$ = rare earth) with Bi
square nets show superconductivity while insulating La$_2$O$_2$Bi shows high
hole mobility, by expanding the c-axis length through oxygen intercalation. In
this study, alkaline earth metal oxides (CaO, SrO, and BaO) were co-sintered
with La$_2$O$_2$Bi. CaO and BaO served as oxygen intercalants without
incorporation of Ca and Ba in La$_2$O$_2$Bi. On the other hand, SrO served as
not only oxygen intercalant but also hole dopant via Sr substitution with La in
La$_2$O$_2$Bi. The oxygen intercalation and hole doping resulted in expansion
of the c-axis length, contributing to improved electrical conduction. In
addition, the hole mobility was enhanced up to 150 cm$^2$V$^{-1}$s$^{-1}$ in
La$_2$O$_2$Bi, which almost doubles the mobility in previous study.

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The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex