Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic Theory for Scanning Tunneling Microscopy Spectra in
  Infinite-Layer Nickelate Superconductors   Recent scanning tunneling microscopy (STM) observation of U-shaped and
V-shaped spectra (and their mixture) in superconducting Nd$_{1-x}$Sr$_x$NiO$_2$
thin films has been interpreted as presence of two distinct gap symmetries in
this nickelate superconductor [Gu et al., Nat. Comm. 11, 6027 (2020)]. Here,
using a two-band model of nickelates capturing dominant contributions from
Ni-$3d_{x^2-y^2}$ and rare-earth (R)-$5d_{3z^2 - r^2}$ orbitals, we show that
the experimental observation can be simply explained within a pairing scenario
characterized by a conventional $d_{x^2-y^2}$-wave gap structure with lowest
harmonic on the Ni-band and a $d_{x^2-y^2}$-wave gap with higher-harmonics on
the R-band. We perform realistic simulations of STM spectra employing
first-principles Wannier functions to properly account for the tunneling
processes and obtain V, U, and mixed spectral line-shapes depending on the
position of the STM tip within the unit cell. The V- and U-shaped spectra are
contributed from Ni and R-bands, respectively, and Wannier functions, in
essence, provide position-dependent weighing factors, determining the spectral
line-shape at a given intra-unit cell position. We propose a phase-sensitive
experiment to distinguish between the proposed $d$-wave gap structure and
time-reversal symmetry breaking $d+is$ gap which yields very similar intra-unit
cell spectra.

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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: math
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: plasm-ph
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The categories of this paper are: supr-con