Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: Correlated Electrons: Theory 2
TT 34.13: Vortrag
Donnerstag, 8. September 2022, 18:15–18:30, H23
Bound by three-body interactions — •Gary Ferkinghoff1, Leanna Müller1, Umesh Kumar2, Götz S. Uhrig1, and Benedikt Fauseweh3 — 1Condensed Matter Theory, Technische Universitat Dortmund, Otto-Hahn-Straße 4, 44227 Dortmund, Germany — 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA — 3Institute for Software Technology, German Aerospace Center (DLR), Linder Hohe, 51147 Cologne, Germany
Stable bound quantum states are ubiquitous in nature. Mostly, they result from the interaction of only pairs of particles, so called two-body interactions, even when complex many-particle structures are formed. We show that three-quasi-particle bound states occur in a generic, experimentally accessible solid state system: antiferromagnetic spin ladders, related to high-temperature superconductors. Strikingly, this binding is induced by genuine three-quasi-particle interactions; without them there is no bound state. We compute the dynamic exchange structure factor required for the experimental detection of the predicted state by resonant inelastic x-ray scattering for realistic material parameters. Our work enables us to quantify these elusive interactions and unambiguously establishes their effect on the dynamics of the quantum many-particle state. In this talk we will present the main results of our study, briefly explain the theoretical tools that we used and present an experimental setting for verifying our theoretical results.