The magic angle of twisted graphene

Graphene, a two-dimensional material composed exclusively of carbon, has revealed extraordinary properties, including thermal and electrical conductivity, transparency, and flexibility. When combined, these properties become ...

Seeing stable topology using instabilities

We are most familiar with the four conventional phases of matter: solid, liquid, gas, and plasma. Changes between two phases, known as phase transitions, are marked by abrupt changes in material properties such as density. ...

CSI Solid-State: The fingerprints of quantum effects

In solid-state physics, the precise interactions of electrons are analyzed through meticulous detective work, ultimately to gain a better understanding of fundamental physical phenomena.

High-throughput screening for Weyl semimetals with S4 symmetry

A new topological invariant χ is defined in systems with S4 symmetry to diagnose the existence of Weyl fermions. By calculating χ, the computational cost for searching Weyl semimetals is greatly reduced. Recently, Gao et ...