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- Title
Momentum-resolved spin-conserving two-triplon bound state and continuum in a cuprate ladder.
- Authors
Tseng, Yi; Paris, Eugenio; Schmidt, Kai P.; Zhang, Wenliang; Asmara, Teguh Citra; Bag, Rabindranath; Strocov, Vladimir N.; Singh, Surjeet; Schlappa, Justine; Rønnow, Henrik M.; Schmitt, Thorsten
- Abstract
Studying multi-particle elementary excitations has provided unique access to understand collective many-body phenomena in correlated electronic materials, paving the way towards constructing microscopic models. In this work, we perform O K-edge resonant inelastic X-ray scattering (RIXS) on the quasi-one-dimensional cuprate Sr 14 Cu 24 O 41 with weakly-doped spin ladders. The RIXS signal is dominated by a dispersing sharp mode ~ 270 meV on top of a damped incoherent component ~ 400-500 meV. Comparing with model calculations using the perturbative continuous unitary transformations method, the two components resemble the spin-conserving ΔS = 0 two-triplon bound state and continuum excitations in the spin ladders. Such multi-spin response with long-lived ΔS = 0 excitons is central to several exotic magnetic properties featuring Majorana fermions, yet remains unexplored given the generally weak cross-section with other experimental techniques. By investigating a simple spin-ladder model system, our study provides valuable insight into low-dimensional quantum magnetism. Quasi-one-dimensional spin ladders are useful models to study collective many-body phenomena. Here, the authors investigate the excitations of weakly hole-doped cuprate ladders using oxygen K-edge resonant inelastic X-ray scattering revealing fingerprints of spin singlet multi-triplon bound state and continuum modes that are relevant to understanding various collective spin phenomena, such as Majorana fermions.
- Subjects
BOUND states; SPIN excitations; X-ray scattering; QUASIPARTICLES; UNITARY transformations; MAJORANA fermions; CUPRATES
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01250-9