Momentum-resolved spin-conserving two-triplon bound state and continuum in a cuprate ladder

Tseng Y, Paris E, Schmidt KP, Zhang W, Asmara TC, Bag R, Strocov VN, Singh S, Schlappa J, Rønnow HM, Schmitt T (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Communications Physics Springer Nature

Book Volume: 6

Article Number: 138

Journal Issue: 1

DOI: 10.1038/s42005-023-01250-9

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 14Cu 24O 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.

Authors with CRIS profile

Kai Phillip Schmidt Professur für Theoretische Physik

Additional Organisation(s)

FAU Profilzentrum Licht.Materie.Quantentechnologien (FAU LMQ)

Involved external institutions

Paul Scherrer Institute (PSI) CH Switzerland (CH) Indian Institute of Science Education & Research (IISER) - Pune IN India (IN) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH)

How to cite

APA:

Tseng, Y., Paris, E., Schmidt, K.P., Zhang, W., Asmara, T.C., Bag, R.,... Schmitt, T. (2023). Momentum-resolved spin-conserving two-triplon bound state and continuum in a cuprate ladder. Communications Physics, 6(1). https://doi.org/10.1038/s42005-023-01250-9

MLA:

Tseng, Yi, et al. "Momentum-resolved spin-conserving two-triplon bound state and continuum in a cuprate ladder." Communications Physics 6.1 (2023).

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