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Spin Dynamics of Supramolecular Dimer [Mn4]2 Interacting With a Spin-polarized Electron |
| ZHANG Guo-Feng1,2;GAO Ying-Fang2;YIN Wen1,2;LIANG Jiu-Qing2;YAN Qi-Wei1 |
| 1State Key Laboratory of Magnetism, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
2Institute of Theoretical Physics, Shanxi University, Taiyuan 030006 |
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| Cite this article: |
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ZHANG Guo-Feng, GAO Ying-Fang, YIN Wen et al 2004 Chin. Phys. Lett. 21 598-600 |
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Abstract A new family of the supramolecular antiferromagnetically exchange-coupled dimer of single-molecules magnets, [Mn4]2, really behave as a quantum mechanical coupled system and can be used for quantum computation [Tiron et al (2003) Phys. Rev. Lett. 91 227203]. We study the time evolution of [Mn4]2 dimer interacting with an injected electron by solving the time-dependent Schrödinger equations. We find that the variations of [Mn4]2 dimer magnetization and the electron spin crucially depend on the exchange interaction strength. Time evolution of the entanglement between the injected electron and supramolecular dimer [Mn4]2 is evaluated. It is observed that entanglement oscillates in time and is closely related to the spin variation of injected electron. From these characteristics the technique for the reversing and read-out of supramolecular dimer [Mn4]2 spin states is suggested.
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| Keywords:
03.65.-w
72.10.Fk
72.25.Hg
75.45.+j
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Published: 01 April 2004
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| PACS: |
03.65.-w
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(Quantum mechanics)
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72.10.Fk
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(Scattering by point defects, dislocations, surfaces, and other imperfections (including Kondo effect))
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72.25.Hg
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(Electrical injection of spin polarized carriers)
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75.45.+j
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(Macroscopic quantum phenomena in magnetic systems)
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