Quantum entanglement in mixed-spin trimer: Effects of a magnetic field and heterogeneous g-factors
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2024
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| _version_ | 1866913519002189824 |
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| author | Adamyan, Zhirayr Ohanyan, Vadim |
| author_facet | Adamyan, Zhirayr Ohanyan, Vadim |
| contents | Mixed spin-(1/2,1/2,1) trimer with two different Landé g-factors and two different exchange couplings is considered. The main feature of the model is non-conserving magnetization. The Hamiltonian of the system is diagonalized analytically. We presented a detailed analysis of the ground state properties, revealing several possible ground state phase diagrams and magnetization profiles. The main focus is on how non-conserving magnetization affects quantum entanglement. We have found that non-conserving magnetization can bring to the continuous dependence of the entanglement quantifying parameter (negativity) on magnetic field within the same eigenstate, while for the case of uniform $g$-factors it is a constant. The main result is an essential enhancement of the entanglement in case of uniform couplings for one pair of spins caused by an arbitrary small difference in the values of $g$-factors. This enhancement is robust and brings to almost 7-fold increasing of the negativity. We have also found weakening of entanglement for other cases. Thus, non-conserving magnetization offers a broad opportunity to manipulate the entanglement by means of magnetic field. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_00178 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quantum entanglement in mixed-spin trimer: Effects of a magnetic field and heterogeneous g-factors Adamyan, Zhirayr Ohanyan, Vadim Statistical Mechanics Mixed spin-(1/2,1/2,1) trimer with two different Landé g-factors and two different exchange couplings is considered. The main feature of the model is non-conserving magnetization. The Hamiltonian of the system is diagonalized analytically. We presented a detailed analysis of the ground state properties, revealing several possible ground state phase diagrams and magnetization profiles. The main focus is on how non-conserving magnetization affects quantum entanglement. We have found that non-conserving magnetization can bring to the continuous dependence of the entanglement quantifying parameter (negativity) on magnetic field within the same eigenstate, while for the case of uniform $g$-factors it is a constant. The main result is an essential enhancement of the entanglement in case of uniform couplings for one pair of spins caused by an arbitrary small difference in the values of $g$-factors. This enhancement is robust and brings to almost 7-fold increasing of the negativity. We have also found weakening of entanglement for other cases. Thus, non-conserving magnetization offers a broad opportunity to manipulate the entanglement by means of magnetic field. |
| title | Quantum entanglement in mixed-spin trimer: Effects of a magnetic field and heterogeneous g-factors |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2405.00178 |