See: 2г—4 Apr 2026

or similar, there are several recent papers on 2D semiconductors and spinels: CrGa

superconformal field theories (SCFTs) placed on a specific geometry ( : Side 1 : Reducing the 4D theory on a Riemann surface Σcap sigma leads to a family of 2D unitary SCFTs. Side 2 : Reducing the same 4D theory on a sphere S2cap S squared See: 2Г—4

If your query was searching for materials with the chemical formula X2YSe4cap X sub 2 cap Y cap S e sub 4 or similar, there are several recent papers on

: A study on ResearchGate identifies this as a 2D spin-gapless ferromagnetic semiconductor with potential for spintronics. MnSc See: 2Г—4

: A paper in ScienceDirect discusses the wafer-scale synthesis of wide bandgap 2D layers for electronic applications. [2601.00058] $2+2=4$ - arXiv