Fig. 4: A possible magnetoelectric effect in Tl₂NO₂/WTe₂ heterostructure.

a, b The charge density differences in spin-up and spin-down channels for Tl₂NO₂/WTe₂ heterostructure with polarization directions pointing (a) upward and (b) downward. Red, wathet, gray, orange, and green spheres denote O, N, Tl, Te, and W atoms, respectively. The green arrows denote the direction of polarizations. The interlayer distance is donated by d. (c, d) The spin-resolved band structure of the Tl₂NO₂/WTe₂ heterostructure with polarization directions pointing (c) upward and (d) downward. The orange and violet lines indicate the spin-up and spin-down bands contributed by Tl₂NO₂ monolayer, respectively. The sizes of the red and green dots represent the weights of spin-up and spin-down states contributed by the WTe₂ monolayer, respectively.