Condensed Matter Seminar - Emergent Quantum Phenomena in Layered Ruthenates: Insights from ARPES, Thin-Film Epitaxy, and Quantum Transport

Event details Date: Thursday, October 15, 2026 Time: 11:30 AM to 12:30 PM Location: None Type: Lecture / Workshop About this event Strongly correlated oxide materials exhibit a wide range of emergent quantum phenomena arising from the interplay of charge, spin, orbital, and lattice degrees of freedom. In this talk, I will present our recent studies of layered ruthenates using synchrotron-based angle- and spin-resolved photoemission spectroscopy (ARPES/SARPES), thin-film epitaxy, and quantum transport measurements. I will discuss the layer-dependent electronic structure and spin polarization of the triple-layered ruthenate Sr₄Ru₃O₁₀ [1], followed by recent advances in the epitaxial growth, strain-engineered electronic structure, and magnetotransport properties of Sr₃Ru₂O₇ thin films [2,3]. I will also highlight our development of an in situ CO₂-laser substrate preparation methodology for achieving atomically controlled oxide surfaces for high-quality epitaxial growth [4]. Together, these studies demonstrate how epitaxial and interface engineering can be used to uncover and control emergent phenomena in quantum materials. References [1] P. Ngabonziza et al., Physical Review B 111, 115146 (2025). [2] P. Ngabonziza et al., Physical Review Materials 8, 044401 (2024). [3] S. Sajeev et al., Electronic Structure of Epitaxial Films of the Bilayer Strontium Ruthenate: Sr₃Ru₂O₇, arXiv:2602.07747 (2026). [4] N. R. Leyo et al., In-Situ Thermal Preparation by CO₂-Laser and Chemical Characterization of Oxide Substrates Across Multiple Crystallographic Orientations, in preparation (2026). Official event details: https://calendar.duke.edu/show?fq=id%3ACAL-8a002ad8-9f611855-019f-803f9f13-00006931demobedework%40mysite.edu