Two-dimensional Tin on Substrates

We investigate 2D Sn on substrates and its electronic, magnetic, and quantum topological properties. Substrates can drastically change the Sn properties. For example, 2D Sn transforms into a 2D Weyl semimetal when large compressive strain is applied by substrates, such as 2D Sn, metals, or insulator substrates. In contrast to the buckled structure of freestanding stanene, the inversion symmetry of tin disappears with large compressive strain, which transforms a 2D topological insulator into a Weyl semimetal. We discuss realistic substrates that can accommodate desirable electronic and topological properties, and even magnetic properties to 2D Sn. Our findings provide a new avenue to experimentally realize new 2D quantum materials.