Decoupling carrier concentration and electron-phonon coupling in oxide heterostructures observed with resonant inelastic x-ray scattering

Abstract

We report the observation of multiple phonon satellite features in ultra thin superlattices of form $n$SrIrO${}_3$/$m$SrTiO${}_3$ using resonant inelastic x-ray scattering. As the values of $n$ and $m$ vary the energy loss spectra show a systematic evolution in the relative intensity of the phonon satellites. Using a closed-form solution for the cross section, we extract the variation in the electron-phonon coupling strength as a function of $n$ and $m$. Combined with the negligible carrier doping into the SrTiO${}_3$ layers, these results indicate that tuning of the electron-phonon coupling can be effectively decoupled from doping. This work showcases both a feasible method to extract the electron-phonon coupling in superlattices and unveils a potential route for tuning this coupling which is often associated with superconductivity in SrTiO${}_3$-based systems.

arXiv comment4 pages, 5 figures

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• Generalization of the Franck-Condon model for phonon excitations by resonant inelastic X-ray scattering
• Strain-modulated Slater-Mott crossover of pseudospin-half square-lattice in (SrIrO3)1/ (SrTiO3)1 superlattices
• Probing electron-phonon interactions away from the Fermi level with resonant inelastic x-ray scattering
• Disparate exciton-phonon couplings for zone center and boundary phonons in solid-state graphite
• Coupling of Electronic Transitions to Ferroelectric Order in a 2D Semiconductor
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Beyond the single-site approximation modeling of electron-phonon coupling effects on resonant inelastic X-ray scattering spectra
• Octahedral tilting induced isospin reorientation transition in iridate heterostructures
• Theory of electron-phonon interactions in extended correlated systems probed by resonant inelastic x-ray scattering
• Quasi-2D anomalous Hall Mott insulator of topologically engineered Jeff =1/2 electrons
• Reconciling monolayer and bilayer $J_{\mathrm{eff}}=1/2$ square lattices in hybrid oxide superlattice
• Strong long-wavelength electron-phonon coupling in Ta${}_2$Ni(Se,S)${}_5$
• Evolution of orbital excitations from insulating to superconducting MgTi${}_2$O${}_4$ films
• Magnetism in artificial Ruddlesden-Popper iridates leveraged by structural distortions
• Probing electronic and magnetic transitions of short periodic nickelate superlattices using synchrotron x-ray
• Theory of dispersive optical phonons in resonant inelastic x-ray scattering experiments