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Controllable Magnetic Proximity Effect and Charge Transfer in 2D Semiconductor and Double‐Layered Perovskite Manganese Oxide van der Waals Heterostructure
Author(s) -
Zhang Yan,
Shinokita Keisuke,
Watanabe Kenji,
Taniguchi Takashi,
Goto Masato,
Kan Daisuke,
Shimakawa Yuichi,
Moritomo Yutaka,
Nishihara Taishi,
Miyauchi Yuhei,
Matsuda Kazunari
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202003501
Subject(s) - trion , materials science , exciton , condensed matter physics , heterojunction , photoluminescence , ferromagnetism , paramagnetism , van der waals force , dielectric , optoelectronics , physics , quantum mechanics , molecule
Optically generated excitonic states (excitons and trions) in transition metal dichalcogenides are highly sensitive to the electronic and magnetic properties of the materials underneath. Modulation and control of the excitonic states in a novel van der Waals (vdW) heterostructure of monolayer MoSe 2 on double‐layered perovskite Mn oxide ((La 0.8 Nd 0.2 ) 1.2 Sr 1.8 Mn 2 O 7 ) is demonstrated, wherein the Mn oxide transforms from a paramagnetic insulator to a ferromagnetic metal. A discontinuous change in the exciton photoluminescence intensity via dielectric screening is observed. Further, a relatively high trion intensity is discovered due to the charge transfer from metallic Mn oxide under the Curie temperature. Moreover, the vdW heterostructures with an ultrathin h ‐BN spacer layer demonstrate enhanced valley splitting and polarization of excitonic states due to the proximity effect of the ferromagnetic spins of Mn oxide. The controllable h ‐BN thickness in vdW heterostructures reveals a several‐nanometer‐long scale of charge transfer as well as a magnetic proximity effect. The vdW heterostructure allows modulation and control of the excitonic states via dielectric screening, charge carriers, and magnetic spins.