Kitaev honeycomb antiferromagnet in a field: quantum phase diagram for general spin
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2021
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| _version_ | 1866912060996059136 |
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| author | Jahromi, Saeed S. Hörmann, Max Adelhardt, Patrick Fey, Sebastian Karamnejad, Hooman Orus, Roman Schmidt, Kai Phillip |
| author_facet | Jahromi, Saeed S. Hörmann, Max Adelhardt, Patrick Fey, Sebastian Karamnejad, Hooman Orus, Roman Schmidt, Kai Phillip |
| contents | We combine tensor-network approaches and high-order linked-cluster expansions to investigate the quantum phase diagram of the antiferromagnetic Kitaev's honeycomb model in a magnetic field for general spin values. For the pure Kitaev model, tensor network calculations confirm the absence of fluxes and spin-spin correlations beyond nearest neighbor in the ground state, but signal a breaking of the discrete orientational symmetry for $S\in\{1,3/2,2\}$ inline with the semiclassical limit. An intermediate region between Kitaev phases and the high-field polarized phase is demonstrated for all considered spin values. In this intermediate region the tensor network results display a sequence of potential phases whose number increases with the spin value. Each of these can be characterized by distinct local magnetization patterns while the total magnetization increases smoothly as a function of the field. The analysis of the high-field zero-momentum gap and the associated spectral weight of the polarized phase for general spin $S$ obtained by linked-cluster expansions is consistent with an unconventional quantum critical breakdown of the high-field polarized phase in accordance with the presence of exotic physics at intermediate Kitaev couplings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2111_06132 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Kitaev honeycomb antiferromagnet in a field: quantum phase diagram for general spin Jahromi, Saeed S. Hörmann, Max Adelhardt, Patrick Fey, Sebastian Karamnejad, Hooman Orus, Roman Schmidt, Kai Phillip Strongly Correlated Electrons We combine tensor-network approaches and high-order linked-cluster expansions to investigate the quantum phase diagram of the antiferromagnetic Kitaev's honeycomb model in a magnetic field for general spin values. For the pure Kitaev model, tensor network calculations confirm the absence of fluxes and spin-spin correlations beyond nearest neighbor in the ground state, but signal a breaking of the discrete orientational symmetry for $S\in\{1,3/2,2\}$ inline with the semiclassical limit. An intermediate region between Kitaev phases and the high-field polarized phase is demonstrated for all considered spin values. In this intermediate region the tensor network results display a sequence of potential phases whose number increases with the spin value. Each of these can be characterized by distinct local magnetization patterns while the total magnetization increases smoothly as a function of the field. The analysis of the high-field zero-momentum gap and the associated spectral weight of the polarized phase for general spin $S$ obtained by linked-cluster expansions is consistent with an unconventional quantum critical breakdown of the high-field polarized phase in accordance with the presence of exotic physics at intermediate Kitaev couplings. |
| title | Kitaev honeycomb antiferromagnet in a field: quantum phase diagram for general spin |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2111.06132 |