Adiabatic Spin Pump through a Molecular Antiferromagnet Ce3Mn8III

作者：Gu Jie; Li Xiang Guo; Cheng Hai Ping; Zhang X G

来源：Journal of Physical Chemistry C, 2018, 122(2): 1422-1429.

DOI：10.1021/acs.jpcc.7b11387

We show that the spin-dependent charging energy recently discovered in a molecular antiferromagnet enables an adiabatic spin pump, without requiring a magnetic field or tunable spin orbit coupling, when the molecule is connected to two unpolarized electrodes with oscillating chemical potentials. Onsite Coulomb repulsion between electrons of opposite spin orientations causes a spin-dependent suppression of the current between the two leads, leading to a pumped spin current. Consequently, the Berry-phase-like geometric current is highly spin-polarized. We explore the space of driving parameters to demonstrate the generation of either a fully polarized or a pure spin current. Negative differential conductance is allo predicted. These possibilities highlight the advantage of molecular antiferromagnets over ferromagnetic molecules and quantum dots in generating and manipulating low-power spin currents.

• 出版日期2018-1-18