Work

Surface states and finite size effects in triple-fold semimetals

Year: 2025

Type: article

Abstract: Triple-fold or pseudospin-1 semimetals belong to a class of multi-fold materials in which linearly dispersive bands and flat bands intersect at the same point, forming triple-fold crossing points. We conduct an analytical investigation of topologically protected Fermi arc surface states and finite-size effects in three-dimensional triple-fold and doubly degenerate triple-fold semimetals in continuum low-energy models. Higher topological charge of the triple-fold crossing points leads to two Fermi arcs connecting the nodes. For a single triple-fold crossing point, we found that no term in the Hamiltonian with momentum-independent elements can open a gap, prompting us to consider doubly-degenerate triple-fold fermions, where the gap can be opened by mixing the degenerate copies. Thin films of triple-fold semimetals allow for mixing between the surface and bulk states in addition to the discretization of energy levels of the latter.

Source: Journal of Physics Condensed Matter

DOI: 10.1088/1361-648x/ae0916

Authors: A Yu Prykhodko, E V Gorbar, P O Sukhachov

Institutions: Taras Shevchenko National University of Kyiv, Bogolyubov Institute for Theoretical Physics, University of Missouri

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,325

Funder: National Research Foundation of Ukraine