J. Appl. Phys. 132, 015102 (2022); https://doi.org/10.1063/5.0094378 132, 015102 © 2022 Author(s). Observation of bandgap closing in Sr x Ba 1−x BiO 3 films: Evidence toward topological order in BaBiO 3 Cite as: J. Appl. Phys. 132, 015102 (2022); https://doi.org/10.1063/5.0094378 Submitted: 06 April 2022 • Accepted: 21 June 2022 • Published Online: 05 July 2022 Riley Vesto, Hyungsoo Choi and Kyekyoon Kim COLLECTIONS This paper was selected as Featured ARTICLES YOU MAY BE INTERESTED IN A step-by-step guide to perform x-ray photoelectron spectroscopy Journal of Applied Physics 132, 011101 (2022); https://doi.org/10.1063/5.0086359 Top electrode modulated W/Ag/MgO/Au resistive random access memory for improved electronic synapse performance Journal of Applied Physics 132, 014502 (2022); https://doi.org/10.1063/5.0096620 Fröhlich electron–phonon interaction Hamiltonian and potential distribution of a polar optical phonon mode in wurtzite nitride triangular nanowires Journal of Applied Physics 132, 014301 (2022); https://doi.org/10.1063/5.0092503