Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Latent Instabilities in Metallic LaNiO3 Films by Strain Control of
  Fermi-Surface Topology   Strain control is one of the most promising avenues to search for new
emergent phenomena in transition-metal-oxide films. Here, we investigate the
strain-induced changes of electronic structures in strongly correlated LaNiO3
(LNO) films, using angle-resolved photoemission spectroscopy and the dynamical
mean-field theory. The strongly renormalized eg-orbital bands are
systematically rearranged by misfit strain to change its fermiology. As tensile
strain increases, the hole pocket centered at the A point elongates along the
kz-axis and seems to become open, thus changing Fermi-surface (FS) topology
from three- to quasi-two-dimensional. Concomitantly, the FS shape becomes
flattened to enhance FS nesting. A FS superstructure with Q1 = (1/2,1/2,1/2)
appears in all LNO films, while a tensile-strained LNO film has an additional
Q2 = (1/4,1/4,1/4) modulation, indicating that some instabilities are present
in metallic LNO films. Charge disproportionation and spin-density-wave
fluctuations observed in other nickelates might be their most probable origins.

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The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: q-alg