Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Molecular Magnetism

MA 6.12: Vortrag

Montag, 18. März 2024, 12:45–13:00, EB 301

Enhancement and manipulation of quantum entanglement in three-spin clusters by non-conserving magnetization and electric field — •Zhirayr Adamyan^{1, 2}, Vadim Ohanyan^{1, 2}, and Ani Chobanyan¹ — ¹Laboratory of Theoretical Physics, Yerevan State University, 1 Alex Manoogian, 0025 Yerevan, Armenia — ²CANDLE, Synchrotron Research Institute, 31 Acharyan Str., 0040 Yerevan, Armenia

The quantum entanglement of spin states in molecular magnets has important applications in quantum information technologies and quantum computing. Currently, qubit models based on magnetic molecules are being used to develop quantum computation and communication technologies. We consider two models of three-spin molecular magnets with additional features that allow one to manipulate and enhance their entanglement. The first model is a mixed-spin (1/2, 1, 1/2) triangle with two g-factors. The second model is a spin-1/2 triangle with the Katsura-Nagaosa-Balatsky (KNB) mechanism, providing the coupling between spin degrees of freedom and the external electric field. It is shown that non-conserving magnetization originated from the non-uniformity of g-factors leads to an essential increase of the entanglement of certain spin states along with the rich structure of zero-temperature phase diagrams. Whereas, the model with magnetoelectric coupling due to the KNB mechanism offers a wide possibility of manipulation of quantum entanglement by the electric field, both using its magnitude and direction.