nl0c01493_si_001.pdf (2.07 MB)
Antiferromagnet–Semiconductor Van Der Waals Heterostructures: Interlayer Interplay of Exciton with Magnetic Ordering
journal contribution
posted on 2020-05-22, 19:13 authored by Masaru Onga, Yusuke Sugita, Toshiya Ideue, Yuji Nakagawa, Ryuji Suzuki, Yukitoshi Motome, Yoshihiro IwasaVan
der Waals (vdW) heterostructures have attracted great interest
because of their rich material combinations. The discovery of two-dimensional
magnets has provided a new platform for magnetic vdW heterointerfaces;
however, research on magnetic vdW heterointerfaces has been limited
to those with ferromagnetic surfaces. Here, we report a magnetic vdW
heterointerface using layered intralayer-antiferromagnetic MPSe3 (M = Mn, Fe) and monolayer
transition-metal dichalcogenides (TMDs). We found an anomalous upshift
of the excitonic peak in monolayer TMDs below the antiferromagnetic
transition temperature in the MPSe3, capturing
a signature of the interlayer exciton–magnon coupling. This
is a concept extended from single materials to heterointerfaces. Moreover,
this coupling strongly depends on the in-plane magnetic structure
and stacking direction, showing its sensitivity to their magnetic
interfaces. Our finding offers an opportunity to investigate interactions
between elementary excitations in different materials across interfaces
and to search for new functions of magnetic vdW heterointerfaces.