Gastiasoro, M. N., Ruhman, J. & Fernandes, R. M. Superconductivity in dilute SrTiO3: a review. Ann. Phys. 417, 168107 (2020).
Marsiglio, F. Eliashberg theory: a short review. Ann. Phys. 417, 168102 (2020).
Müller, K. A. & Burkard, H. SrTiO3: an intrinsic quantum paraelectric below 4 K. Phys. Rev. B 19, 3593 (1979).
Rowley, S. E. et al. Ferroelectric quantum criticality. Nat. Phys. 10, 367–372 (2014).
Edge, J. M., Kedem, Y., Aschauer, U., Spaldin, N. A. & Balatsky, A. V. Quantum critical origin of the superconducting dome in SrTiO3. Phys. Rev. Lett. 115, 247002 (2015).
Yu, Y., Hwang, H. Y., Raghu, S. & Chung, S. B. Theory of superconductivity in doped quantum paraelectrics. npj Quantum Mater. 7, 63 (2022).
Wölfle, P. & Balatsky, A. V. Superconductivity at low density near a ferroelectric quantum critical point: doped SrTiO3. Phys. Rev. B 98, 104505 (2018).
Gastiasoro, M. N., Temperini, M. E., Barone, P. & Lorenzana, J. Generalized Rashba electron–phonon coupling and superconductivity in strontium titanate. Phys. Rev. Res. 5, 023177 (2023).
Volkov, P. A., Chandra, P. & Coleman, P. Superconductivity from energy fluctuations in dilute quantum critical polar metals. Nat. Commun. 13, 4599 (2022).
Enderlein, C. et al. Superconductivity mediated by polar modes in ferroelectric metals. Nat. Commun. 11, 4852 (2020).
Stucky, A. et al. Isotope effect in superconducting n-doped SrTiO3. Sci. Rep. 6, 37582 (2016).
Hameed, S. et al. Enhanced superconductivity and ferroelectric quantum criticality in plastically deformed strontium titanate. Nat. Mater. 21, 54–61 (2021).
Rischau, C. W. et al. A ferroelectric quantum phase transition inside the superconducting dome of Sr1−xCaxTiO3−δ. Nat. Phys. 13, 643–648 (2017).
Ohtomo, A. & Hwang, H. Y. A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface. Nature 427, 423–426 (2004).
Valentinis, D. et al. Modulation of the superconducting critical temperature due to quantum confinement at the LaAlO3/SrTiO3 interface. Phys. Rev. B 96, 094518 (2017).
Gariglio, S., Gabay, M. & Triscone, J. M. Research update: conductivity and beyond at the LaAlO3/SrTiO3 interface. APL Mater. 4, 060701 (2016).
Caviglia, A. D. et al. Electric field control of the LaAlO3/SrTiO3 interface ground state. Nature 456, 624–627 (2008).
Singh, G. et al. Gate-tunable pairing channels in superconducting non-centrosymmetric oxides nanowires. npj Quantum Mater. 7, 2 (2022).
Chen, C., Avila, J., Frantzeskakis, E., Levy, A. & Asensio, M. C. Observation of a two-dimensional liquid of Fröhlich polarons at the bare SrTiO3 surface. Nat. Commun. 6, 8585 (2015).
Wang, Z. et al. Tailoring the nature and strength of electron–phonon interactions in the SrTiO3(001) 2D electron liquid. Nat. Mater. 15, 835–839 (2016).
Zhang, S. et al. Enhanced superconducting state in FeSe/SrTiO3 by a dynamic interfacial polaron mechanism. Phys. Rev. Lett. 122, 066802 (2019).
Cancellieri, C. et al. Polaronic metal state at the LaAlO3/SrTiO3 interface. Nat. Commun. 7, 10386 (2016).
Qi, R. et al. Measuring phonon dispersion at an interface. Nature 599, 399–403 (2021).
Hoglund, E. R. et al. Emergent interface vibrational structure of oxide superlattices. Nature 601, 556–561 (2022).
Hoglund, E. R. et al. Nonequivalent atomic vibrations at interfaces in a polar superlattice. Adv. Mater. 36, 2402925 (2024).
Yang, H. et al. Phonon modes and electron–phonon coupling at the FeSe/SrTiO3 interface. Nature 635, 332–336 (2024).
Yan, X. et al. Atomic-scale imaging of frequency-dependent phonon anisotropy. Nature 645, 893–899 (2025).
Vogt, H. Hyper-Raman tensors of the zone-center optical phonons in SrTiO3 and KTaO3. Phys. Rev. B 38, 5699 (1988).
Thiel, S., Hammerl, G., Schmehl, A., Schneider, C. W. & Mannhart, J. Tunable quasi-two-dimensional electron gases in oxide heterostructures. Science 313, 1942–1945 (2006).
Singh, G. et al. Stoichiometric control of electron mobility and 2D superconductivity at LaAlO3–SrTiO3 interfaces. Commun. Phys. 7, 149 (2024).
Gazquez, J. et al. Competition between polar and nonpolar lattice distortions in oxide quantum wells: new critical thickness at polar interfaces. Phys. Rev. Lett. 119, 106102 (2017).
Lee, J. S. et al. Titanium dxy ferromagnetism at the LaAlO3/SrTiO3 interface. Nat. Mater. 12, 703–706 (2013).
Tanaka, I. et al. Dopant-modified local chemical bonding at a grain boundary in SrTiO3. Philos. Mag. Lett. 75, 21–27 (1997).
De Groot, F. M. F. et al. Oxygen 1s X-ray absorption of tetravalent titanium oxides: a comparison with single-particle calculations. Phys. Rev. B 48, 2074 (1993).
Aschauer, U. & Spaldin, N. A. Competition and cooperation between antiferrodistortive and ferroelectric instabilities in the model perovskite SrTiO3. J. Phys. Condens. Matter 26, 122203 (2014).
Cancellieri, C. et al. Electrostriction at the LaAlO3/SrTiO3 interface. Phys. Rev. Lett. 107, 056102 (2011).
Lee, P. W. et al. Hidden lattice instabilities as origin of the conductive interface between insulating LaAlO3 and SrTiO3. Nat. Commun. 7, 12773 (2016).
Stengel, M. & Spaldin, N. A. Origin of the dielectric dead layer in nanoscale capacitors. Nature 443, 679–682 (2006).
Sirenko, A. A. et al. Soft-mode hardening in SrTiO3 thin films. Nature 404, 373–376 (2000).
Shi, R. et al. Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface. Nat. Commun. 15, 3418 (2024).
Zhang, S. et al. Role of SrTiO3 phonon penetrating into thin FeSe films in the enhancement of superconductivity. Phys. Rev. B 94, 081116 (2016).
Delugas, P. et al. Spontaneous 2-dimensional carrier confinement at the n-type SrTiO3/LaAlO3 interface. Phys. Rev. Lett. 106, 166807 (2011).
Reyren, N. et al. Superconducting interfaces between insulating oxides. Science 317, 1196–1199 (2007).
Swartz, A. G. et al. Polaronic behavior in a weak-coupling superconductor. Proc. Natl Acad. Sci. USA 115, 1475–1480 (2018).
Gor’kov, L. P. Back to mechanisms of superconductivity in low-doped strontium titanate. J. Supercond. Nov. Magn. 30, 845–852 (2017).
Wang, J. et al. Charge transport in a polar metal. npj Quantum Mater. 4, 61 (2019).
Kalisky, B. et al. Locally enhanced conductivity due to the tetragonal domain structure in LaAlO3/SrTiO3 heterointerfaces. Nat. Mater. 12, 1091–1095 (2013).
Kim, T. H. et al. Polar metals by geometric design. Nature 533, 68–72 (2016).
Liu, C. et al. Tunable superconductivity and its origin at KTaO3 interfaces. Nat. Commun. 14, 951 (2023).
Bréhin, J. et al. Coexistence and coupling of ferroelectricity and magnetism in an oxide two-dimensional electron gas. Nat. Phys. 19, 823–829 (2023).
Dwyer, C. et al. Electron-beam mapping of vibrational modes with nanometer spatial resolution. Phys. Rev. Lett. 117, 256101 (2016).
Soler, J. M. et al. The SIESTA method for ab initio order-N materials simulation. J. Phys. Condens. Matter 14, 2745 (2002).
García, A. et al. Siesta: recent developments and applications. J. Chem. Phys. 152, 204108 (2020).
Perdew, J. P. et al. Restoring the density-gradient expansion for exchange in solids and surfaces. Phys. Rev. Lett. 100, 136406 (2008).
García, A., Verstraete, M. J., Pouillon, Y. & Junquera, J. The psml format and library for norm-conserving pseudopotential data curation and interoperability. Comput. Phys. Commun. 227, 51–71 (2018).