Fermionic Band Dispersions and an Evidence of Cooperon Excitations in a Spin-$1/2$ Trimer Chain
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866918519634919424 |
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| author | Patnaik, P. Srikanth Sen, Snehasish Bera, A. K. Mandal, Sudhansu S. Roy, Anushree Yusuf, S. M. |
| author_facet | Patnaik, P. Srikanth Sen, Snehasish Bera, A. K. Mandal, Sudhansu S. Roy, Anushree Yusuf, S. M. |
| contents | 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 Na$_2$Cu$_3$Ge$_4$O$_{12}$ having a trimer chain consisting of spin-$1/2$ Cu ions, has comprehensively been shown to be consistent with these excitations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_21616 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fermionic Band Dispersions and an Evidence of Cooperon Excitations in a Spin-$1/2$ Trimer Chain Patnaik, P. Srikanth Sen, Snehasish Bera, A. K. Mandal, Sudhansu S. Roy, Anushree Yusuf, S. M. Strongly Correlated Electrons 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 Na$_2$Cu$_3$Ge$_4$O$_{12}$ having a trimer chain consisting of spin-$1/2$ Cu ions, has comprehensively been shown to be consistent with these excitations. |
| title | Fermionic Band Dispersions and an Evidence of Cooperon Excitations in a Spin-$1/2$ Trimer Chain |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2504.21616 |