期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 2, 页码 1422-1429出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b11387
关键词
-
资金
- U.S. National Science Foundation [DMREF-1534401]
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.
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