Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for high-Tc conventional superconductivity at megabar pressures
  in the lithium-sulfur system   Motivated by the recent report of superconductivity above 200 K in
ultra-dense hydrogen sulfide, we search for high-\tc\ conventional
superconductivity in the phase diagram of the binary Li-S system, using {\em
ab-initio} methods for crystal structure prediction and linear response
calculations for the electron-phonon coupling. We find that at pressures higher
than 20 GPa, several new compositions, besides the known Li$_2$S, are
stabilized; many exhibit electride-like {\em interstitial} charge localization
observed in other alkali metal compounds. Of all predicted phases, only Li$_3$S
at P > 640 GPa displays a sizable \tc, in contrast to what is observed in
sulfur and phosphorus hydrides, where several stoichiometries lead to high \tc.
We attribute this difference to 2$s$-2$p$ hybridization and avoided core
overlap, and predict similar behavior for other alkali metal compounds.

29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org