2025/04/30 by P. Srikanth Patnaik, Patnaik, P. Srikanth, Sen, Snehasish +8
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.2504.21616
openalex publication_date 2025/04/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We obtain the solution of the Hamiltonian of an antiferromagnetically coupled spin-1/2 trimer chain in terms of three bands that host three different species of fermions. While the lowest two bands correspond to spin-1/2 fermions, the fermions in the highest band are of spin-3/2. Because the bands are for different species of fermions, the particle-hole excitation channel across the bands is closed. However, fractionalized excitations as spin-1/2 and spin-3/2 fermions in pairs open a cooperon channel of excitations in Raman scattering. The background spectral intensity profile obtained by Raman scattering measurements in Na2Cu3Ge4O12 having a trimer chain consisting of spin-1/2 Cu ions, has comprehensively been shown to be consistent with these excitations.