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Light-element and Purely Charge-based Topological Materials by Derriche, Nassim; Franz, Marcel; Sawatzky, George is a scholarly article available to read on EtoBox.

What is Light-element and Purely Charge-based Topological Materials about?

We examine a class of Hamiltonians characterized by interatomic, interorbital even-odd parity hybridization as a model for a family of topological insulators without the need for spin-orbit coupling. Non-trivial properties of these materials are exemplified by studying the topologically-protected edge states of s-p hybridized alkali and alkaline earth atoms in one and two-dimensional lattices. In 1D the topological features are analogous to the canonical Su-Schrieffer-Heeger model but, remarkably, occur in the absence of dimerization. Alkaline earth chains, with Be standing out due to its gap size and near particle-hole symmetry, are of particular experimental interest since their Fermi energy without doping lies directly at the level of topological edge stats. Similar physics is demonstrated to occur in a 2D honeycomb lattice system of s-p bonded atoms, where dispersive edge states emerge. Lighter elements are predicted using this model to host topological states in contrast to spin-orbit coupling-induced band inversion favoring heaving atoms.

Author

Derriche, Nassim; Franz, Marcel; Sawatzky, George

Published

2024

Language

EN