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DTSTAMP:20261016T110239
DTSTART;TZID=America/Detroit:20261027T160000
DTEND;TZID=America/Detroit:20261027T170000
SUMMARY:Workshop / Seminar:CM-AMO Seminar | Controlling Superconductivity and Topology through Electronic Correlations\, Electron-  Lattice Coupling\, and Interface Engineering
DESCRIPTION:High-temperature superconductivity and topological quantum matter remain among the central challenges in condensed matter physics. Their coexistence offers a promising route toward realizing Majorana zero modes and fault-tolerant quantum technologies. While studies of topological materials and electron-phonon coupling have largely relied on single particle descriptions\, the role of strong electronic correlations remains unresolved. In particular\, it is unclear (i) how correlations modify electron-phonon coupling [1] and lattice dynamics in determining superconducting transition temperatures and (ii) how electron-electron interactions drive topological systems beyond the single-particle limit. \n\nIn this talk\, I will discuss our efforts to address these questions using parameter tuning-free embedded dynamical mean-field theory (eDMFT) [2]. By combining epitaxial thin-film growth\, angle-resolved photoemission spectroscopy (ARPES)\, and scanning tunneling microscopy/spectroscopy (STM/S). Focusing on FeX (X = Se\, S\, Te) thin films on SrTiO₃ (001)\, we demonstrate a strong dependence of the superconducting transition temperature () on the FeX₄ tetrahedral bond angle\, highlighting the crucial role of lattice geometry in correlated superconductivity [3]. We further present evidence for topological superconductivity and identify a distinct phase that competes with strong electronic correlations[4]. Remarkably\, both the measured superconducting gap and the eDMFT-derived electron-phonon coupling exhibit a dome-shaped dependence on the tetrahedral angle [5]. I will then show how these insights can be extended toward a predictive\, materials-by-design framework for topological superconductivity. Applying a multiscale framework to FeTe₀.₅Se₀.₅ and FeSe/GaAs heterostructures\, we predict multiple topological superconducting phases and identify experimentally viable materials platforms in which topology\, superconductivity\, and strong correlations can be engineered in concert [5\,6]. Together\, these results demonstrate how electronic correlations\, lattice geometry\, and interface engineering can be harnessed to control superconductivity and topology\, providing a pathway toward the rational design of correlated topological quantum materials and future Majorana-based quantum technologies.\n\nReferences:\n[1] S. Mandal et al. PRB 89\, 220502(R) (2014)\; S. Gerber et al. Science 357\, 71 (2017).\n[2] A. Sihi\, S. Mandal\, &amp\; K. Haule\, Phys. Rev. B (Lett.) 113\, L201116 (2026)\; (Editor&#39\;s suggestion)\n[3] S. Mandal et al. PRL. 119\, 067004 (2017)\; Q. Zou\, et al. Nano Letters 25\, (47) 16572 (2025)\n[4] H. Lin\, et al. Nature Communications 17\, 1188 (2026)\n[5] Q. Zou\, et al. Phys. Rev. B 114\, 225123 (2026) (Editor&#39\;s suggestion) \n[6] Jacobs et al. arXiv:2609.10381 (2026).
UID:153766-21916289@events.umich.edu
URL:https://events.umich.edu/event/153766
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physics,Science
LOCATION:West Hall - 340
CONTACT:
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