Figure 1 (IMAGE)

Science China Press

Figure 1

Caption

Exfoliated few-layer CrI3. (a) Atomic structures of monolayer CrI3. (b, c) Rhombohedral (b) and monoclinic (c) stacking order in bilayer CrI3. The rhombohedral structure has an out-of-plane C3 axis and a symmetric center (s6=c3+i ), while the monoclinic structure has an in-plane C2 axis and a mirror plane. (d) Optical micrograph of the exfoliated few-layer CrI3. (e) Optical contrast of the CrI3 samples with different numbers of layers (red circles). The blue solid line is calculated results based on Fresnel's equations from Xu et al. (Nature, 2017, 546, 270). (f) Magnetization of bulk CrI3 as a function of temperature, indicating that Tc = ~65 K. Layer-dependent magnetic ordering in atomically-thin CrI3 at 10 K. RMCD signal on a 2L (g), 3L (h) and 4L (i) CrI3 flake, showing antiferromagnetic behavior in bilayer CrI3 and ferromagnetic behavior in 3L and 4L CrI3. The blue arrows indicate the magnetization orientation in different layer.

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