Resonant inelastic x-ray scattering (RIXS) has proven a powerful tool to
investigate dynamic magnetic correlations, yielding complementary insights
compared to neutron scattering. A key issue is the interpretation of
spectroscopic measurements in terms of quasi-particle excitations. In this
paper we study the spin-conserving channel of RIXS spectra for two-leg quantum
spin ladders using continuous unitary transformations. We find that
multi-triplon continua and bound states are the leading contribution, opening
new venues for observing and characterizing multi-triplons in quantum spin
systems.Comment: 6 pages, 4 figures + Supplemental Material, comments welcom

Fauseweh, Benedikt

Ferkinghoff, Gary

Kumar, Umesh

Müller, Leanna

Uhrig, Götz S.

English

arXiv

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 large complex many-particle structures are formed. We
show that three-particle bound states occur in a generic, experimentally
accessible solid state system: antiferromagnetic spin ladders, related to
high-temperature superconductors. This binding is induced by genuine
three-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.Comment: 15 pages, 5 figures + Supplemental Materia

Schmiedinghoff, Gary

arXiv.org e-Print Archive

Three-body bound states in antiferromagnetic spin ladders

Schmiedinghoff, Garry

Leanna, Müller

Uhrig, Götz

Institute of Transport Research:Publications

Accessing Multi-triplons in Spin Ladders using Resonant Inelastic X-ray
  Scattering

Accessing Multi-triplons in Spin Ladders using Resonant Inelastic X-ray Scattering

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