Van der Waals engineering of ferromagnetic semiconductor heterostructures for spin and valleytronics Article Swipe
YOU?
·
· 2018
· Open Access
·
· DOI: https://doi.org/10.1126/sciadv.1603113
· OA: W2618307332
The integration of magnetic material with semiconductors has been fertile\nground for fundamental science as well as of great practical interest toward\nthe seamless integration of information processing and storage. Here we create\nvan der Waals heterostructures formed by an ultrathin ferromagnetic\nsemiconductor CrI3 and a monolayer of WSe2. We observe unprecedented control of\nthe spin and valley pseudospin in WSe2, where we detect a large magnetic\nexchange field of nearly 13 T and rapid switching of the WSe2 valley splitting\nand polarization via flipping of the CrI3 magnetization. The WSe2\nphotoluminescence intensity strongly depends on the relative alignment between\nphoto-excited spins in WSe2 and the CrI3 magnetization, due to ultrafast\nspin-dependent charge hopping across the heterostructure interface. The\nphotoluminescence detection of valley pseudospin provides a simple and\nsensitive method to probe the intriguing domain dynamics in the ultrathin\nmagnet, as well as the rich spin interactions within the heterostructure.\n
