Gating and photogalvanic effect tuning the spin transport in single chromium porphyrin from first principles

Magnetic molecules are of crucial importance for miniaturizing future spintronic devices. In this work, we investigated the possibility of modulating spin transport in a single chromium porphyrin molecule using the gate voltage and the photogalvanic effect. It was found that, under a certain bias voltage, the gate voltage can effectively regulate the spin filtering effect. Moreover, when the molecule is asymmetrically connected to two gold nanowire electrodes, fully polarized and even pure spin currents can be generated under the irradiation of linearly polarized light. Our findings offer potential pathways for designing single-molecule spintronics and optoelectronic devices.