Designer spin models in tunable two-dimensional nanographene lattices
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866913224333459456 |
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| author | Henriques, J. C. G. Ferri-Cortés, Mar Fernández-Rossier, J. |
| author_facet | Henriques, J. C. G. Ferri-Cortés, Mar Fernández-Rossier, J. |
| contents | Motivated by recent experimental breakthroughs, we propose a strategy to design two-dimensional spin lattices with competing interactions that lead to non-trivial emergent quantum states. We consider $S=1/2$ nanographenes with $C_3$ symmetry as building blocks, and we leverage the potential to control both the sign and the strength of exchange with first neighbours to build a family of spin models. Specifically, we consider the case of a Heisenberg model in a triangle-decorated honeycomb lattice with competing ferromagnetic and antiferromagnetic interactions whose ratio can be varied in a wide range. Based on exact diagonalization of both fermionic and spin models we predict a quantum phase transition between a valence bond crystal of spin singlets with triplon excitations living in a Kagomé lattice and a Néel phase of effective $S=3/2$ in the limit of dominant ferromagnetic interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_01783 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Designer spin models in tunable two-dimensional nanographene lattices Henriques, J. C. G. Ferri-Cortés, Mar Fernández-Rossier, J. Mesoscale and Nanoscale Physics Strongly Correlated Electrons Motivated by recent experimental breakthroughs, we propose a strategy to design two-dimensional spin lattices with competing interactions that lead to non-trivial emergent quantum states. We consider $S=1/2$ nanographenes with $C_3$ symmetry as building blocks, and we leverage the potential to control both the sign and the strength of exchange with first neighbours to build a family of spin models. Specifically, we consider the case of a Heisenberg model in a triangle-decorated honeycomb lattice with competing ferromagnetic and antiferromagnetic interactions whose ratio can be varied in a wide range. Based on exact diagonalization of both fermionic and spin models we predict a quantum phase transition between a valence bond crystal of spin singlets with triplon excitations living in a Kagomé lattice and a Néel phase of effective $S=3/2$ in the limit of dominant ferromagnetic interactions. |
| title | Designer spin models in tunable two-dimensional nanographene lattices |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.01783 |