Effects of dilution in a two-dimensional topological magnon insulator

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Oliveira, MS (Author) Other; Antao, TVC (Author) Other; Eduardo V Castro (Author) FCUP; Peres, N (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: PHYSICAL REVIEW B

Vol. 111

ISSN: 2469-9950

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Other information

Authenticus ID: P-018-03Q

DOI: 10.1103/physrevb.111.014204

Abstract (EN): We study the effect of diluting a two-dimensional ferromagnetic insulator hosting a topological phase in the clean limit. By considering the ferromagnetic Heisenberg model in the honeycomb lattice with second-nearestneighbor Dzyaloshinskii-Moriya interaction, and working in the linear spin-wave approximation, we establish the topological phase diagram as a function of the fraction p of diluted magnetic atoms. The topological phase with Chern number C = 1 is robust up to a moderate dilution p(1)(& lowast;), while above a higher dilution p & lowast;2 > p & lowast;1 the system becomes trivial. Interestingly, both p(2)(& lowast;) and p & lowast;2 are below the classical percolation threshold pc for the honeycomb lattice, which gives physical significance to the obtained phases. In the topological phase for p p(2)(& lowast;), when all states become localized, the system shows C = 0 as expected for a trivial phase. Replacing magnetic with nonmagnetic atoms in a system hosting a magnon Chern insulator in the clean limit puts all the three phases within experimental reach.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10