Electronic theory for scanning tunneling microscopy spectra in infinite-layer nickelate superconductors
نویسندگان
چکیده
The recent scanning tunneling microscopy (STM) observation of $\mathsf{U}$-shaped and $\mathsf{V}$-shaped spectra (and their mixture) in superconducting ${\mathrm{Nd}}_{1\text{\ensuremath{-}}x}{\mathrm{Sr}}_{x}{\mathrm{NiO}}_{2}$ thin films has been interpreted as the presence two distinct gap symmetries this nickelate superconductor [Gu et al., Nat. Commun. 11, 6027 (2020)]. Here, using a two-band model nickelates capturing dominant contributions from Ni-$3{d}_{{x}^{2}\text{\ensuremath{-}}{y}^{2}}$ rare-earth (R)-$5{d}_{3{z}^{2}\text{\ensuremath{-}}{r}^{2}}$ orbitals, we show that experimental can be simply explained within pairing scenario characterized by conventional ${d}_{{x}^{2}\text{\ensuremath{-}}{y}^{2}}$-wave structure with lowest harmonic on Ni band higher harmonics R band. We perform realistic simulations STM employing first-principles Wannier functions to properly account for processes obtain $\mathsf{V},\mathsf{U},$ mixed spectral line shapes depending position tip unit cell. $\mathsf{V}$- are contributed bands, respectively, functions, essence, provide position-dependent weighting factors, determining shape at given intra-unit-cell position. propose phase-sensitive experiment distinguish between proposed $d$-wave time-reversal symmetry-breaking $d+is$ which yields very similar spectra.
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ژورنال
عنوان ژورنال: Physical review
سال: 2021
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.104.144504