Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cesium-involved electron transfer and electron-electron interaction in
  high-pressure metallic CsPbI3   Electron-phonon coupling was believed to govern the carrier transport in
halide perovskites and related phases. Here we demonstrate that
electron-electron interaction plays a direct and prominent role in the
low-temperature electrical transport of compressed CsPbI3 and renders Fermi
liquid (FL)-like behavior. By compressing {\delta}-CsPbI3 to 80 GPa, an
insulator-to-metal transition occurs, concomitant with the completion of a
sluggish structural transition from the one-dimensional (1D) Pnma ({\delta})
phase to a 3D Pmn21 ({\epsilon}) phase. Deviation from FL behavior is observed
in CsPbI3 upon entering the metallic {\epsilon} phase, which progressively
evolves into a FL-like state at 186 GPa. First-principles density functional
theory calculations reveal that the enhanced electron-electron coupling is
related to the Cs-involved electron transfer and sudden increase of the 5d
state occupation of the high-pressure {\epsilon} phase. Our study presents a
promising strategy for tuning the electronic interaction in halide perovskites
for realizing intriguing electronic states.

9
The categories of this paper are: nlin
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol