  Multifunctional two-dimensional (2D) multiferroics are promising materials
for designing low-dimensional multipurpose devices. The key to
multifunctionality in these materials is breaking the space-inversion and the
time-reversal symmetry, which results in spontaneous electric polarization and
magnetization in the same phase. A new class of 2D materials, Janus 2D
materials, has emerged, which works on a similar principle of breaking
out-of-plane symmetry to invoke new exciting functionalities in the 2D
materials, such as an out-of-plane piezoelectric polarization. In this work, a
new group of 2D multiferroic Janus monolayers VOXY (X/Y = F, Cl, Br, or I, and
X$\not=$Y) is derived by breaking the out-of-plane symmetry in the parent
multiferroics VOX$_2$ (X = F, Cl, Br, or I). The structural, magnetic, and
ferroelectric properties of multiferroics VOX$_2$ are compared with their Janus
derivatives. We calculated in-plane and out-of-plane piezoelectric polarization
for VOX$_2$ and VOXY series, where VOFCl, VOFBr, VOFI, and VOClI are found to
have significant out-of-plane piezoelectric polarization. Our theoretical work
predicts a new series of 2D multiferroic materials and encourages their further
investigation for high-performance nanoelectronic devices.
