Spin-Valley dependent optical response at monolayer transition metal dichalcogenide/ferrimagnet interface

Monolayer transition metal dichalcogenides (TMDs) is one of the potential candidates for valley-based electronics, since valley degree of freedom in TMDs couples with orbital and spin degree of freedoms, so that it can be manipulated by optical or magnetic method. So far, valley-optical responses related with orbital degree of freedom have been elucidated in monolayer TMDs. Recently, TMDs/magnet interfaces are widely studied as an ideal platform for studying the spin-valley related phenomena[1][2].
Here I report the characteristic optical responses at new interface of TMDs and ferrimagnetic Fe₃O₄. Valley-Zeeman effect and the probable spin-valley relaxation, which has been reported in previous works of TMDs/ferromagnet interfaces, have been also observed at the new interface. In the presentation, I also discuss the microscopic origin of the observed spin-valley relaxation.

[1] D. Zhong. et al., Science Advances 3, e1603113 (2017).
[2] Y. Ye. et al., Nature nanotech. 11, 598 (2016).