Also called Janus WSSe, MXY monolayers
A sheet whose two faces are made of different elements – named after Janus, the two-faced Roman god. Because top and bottom no longer match, the layer carries a permanent electric field across its own thickness. That built-in field splits electron spins, makes the sheet piezoelectric in a direction ordinary TMDCs are not, and could help separate charges for solar fuels. Janus layers cannot be grown directly: they are made by rebuilding one face of an existing monolayer.
They are coordination polyhedra. Only complete ones are drawn.
Readiness runs lab → prototype → pilot → deployed.
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Reducing the symmetry to C3v activates out-of-plane piezoelectric coefficients (d31 and d33) and Rashba terms that vanish in D3h. Slab calculations need a dipole correction – the potential step across the layer makes an uncorrected periodic cell unphysical – and piezoelectric tensors should come from DFPT or Berry-phase methods with ionic relaxation. Simulated Raman and PL signatures that distinguish a true Janus layer from ordered or random S/Se alloys are directly useful to experimentalists.
Characterisation is the hard part, because a random MoS2xSe2(1−x) alloy can show a similar PL energy. Combine Raman (for MoSSe, an A1 mode near 288 cm−1 and an E mode near 355 cm−1, distinct from alloy modes), angle-resolved XPS or cross-sectional HAADF-STEM to confirm that S and Se sit on opposite faces, and polarisation-resolved SHG for the symmetry change. Map entire flakes – conversion is rarely uniform, and edges and grain boundaries convert differently from interiors.
Not yet manufacturable: conversion routes are slow, uniformity is poor, and plasma or thermal damage degrades quality. If room-temperature atomic replacement matures, the most plausible early uses are sensors and piezoelectric components rather than logic.
The newest items tagged Janus MoSSe, from the news feed updated 5 Oct 2026.
Topological magnetization textures play a central role in modern magnetism. For many applications, spin textures with different topological charges Q in the same system are particularly attractive. Although the coexistence of skyrmions and antiskyrmions (|Q| = 1) has been reported in inversion-symmetric magnets…
Electric-field control of magnetic order and valley polarization holds great promise for spintronic and valleytronic applications. However, achieving such electrical modulation remains a fundamental challenge in two-dimensional (2D) van der Waals (vdW) magnets. Herein, via first-principles calculations, we verify that…
Altermagnetism has recently emerged as a distinct magnetic paradigm, yet the exploration of topological spin textures within two-dimensional (2D) altermagnets remains limited. Using first-principles calculations and atomistic spin simulations, we investigate monolayer Cr2X2 and Janus monolayer Cr2XY altermagnets (X…
Strain-gradient engineering via out-of-plane wrinkling offers a powerful route to tune electronic and electromechanical properties in two-dimensional (2D) materials. Here, we systematically investigate the electronic and flexoelectric response of wrinkled Janus MoSSe/MoSeS monolayers using density functional theory…
Motivated by the discovery of bimetallic MXene compounds with Janus metal sites, we investigate Janus MXenes TiM"CO2, where M" = Mo, W. Our computational analysis reveals that broken inversion symmetry in the Janus structure, coupled with strong spin-orbit coupling at M", generates diverse and remarkable…
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