Spin transport properties in ultra-thin black phosphorus

The discovery of graphene and two-dimensional materials provided new platforms to study electronic spin transport and to be used for novel spintronics applications. Graphene has been shown to exhibit desirable spin transport properties such as long spin life time^[1], long spin relaxation length^[2] and up to 100% spin injection efficiency^[3] , even at room temperature. Beyond graphene, in our previous work, we demonstrated all electric spin injection, transport and detection in ultra-thin black phosphorus. In the non-local spin valve geometry, the measured spin relaxation time is as high as 4ns with spin relaxation lengths exceeding 6 μm^[4]. In this work, we measured the spin signal and lifetime at different doping level in the black phosphorus. We also studied the relation between the spin and momentum relaxation time as a function of temperature.

[1]. Drögeler, M. et al. (2016). Nano letters, 16(6), 3533-3539.
[2]. Kamalakar, M. V et al (2015). Nature communications, 6, 6766.
[3]. Gurram, M. et al. (2017). Nature communications, 8(1), 248.
[4]. Avsar, A., et al. (2017) Nature Physics, 13(9), nphys4141.