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
Spin Dynamics of Supramolecular Dimer [Mn4]2 Interacting With a Spin-polarized Electron
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
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.
2004, Vol. 21 
