Journal Article Research Support, Non-U.S. Gov't borophene 2D polar metal Dirac cone angle-resolved photoemission spectroscopy angle‐resolved photoelectron spectroscopy angle‐resolved photoemission spectroscopy anisotropic band structure buckled honeycomb binary lattice charge transfer conjugated small molecules dirac nodal lines/points distortion first-principles calculations first‐principles calculations formamidinium lead iodide hourglass fermion surface state long-range order magnetic structures mixed phases molecular beam epitaxy on‐surface synthesis perovskite phase separation quantum dot solar cells quasi-1D chains scanning tunneling spectroscopy, π‐conjugated polymer topological crystalline insulator