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A New Three-Dimensional Subsulfide Ir₂In₈S with Dirac Semimetal Behavior.

Jason F Khoury¹, Alexander J E Rettie^2,3, Mojammel A Khan²

¹Department of Chemistry , Northwestern University , Evanston , Illinois 60208 , United States.

Journal of the American Chemical Society

|November 8, 2019

Summary

Researchers synthesized a new type-II Dirac semimetal, Ir2In8S, which is air-stable and exhibits high electron mobility and large magnetoresistance. This discovery introduces a promising new material for studying topological semimetals.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Physics

Background:

Dirac and Weyl semimetals possess unique quasiparticles with exceptional transport characteristics.
Numerous topological semimetals are predicted, but experimental validation is often hindered by synthesis challenges or phase instability.

Purpose of the Study:

To synthesize and characterize a new type-II Dirac semimetal, Ir2In8S.
To investigate its structural, electronic, and transport properties for potential applications in topological materials research.

Main Methods:

Crystal growth of Ir2In8S.
Electronic structure calculations to identify Dirac crossings.
Transport measurements, including magnetoresistance and Shubnikov-de Haas oscillations.

Main Results:

Successfully synthesized the air-stable, type-II Dirac semimetal Ir2In8S with a novel structure type.
Observed two Dirac crossings along the Γ-Z direction.
Measured high electron carrier mobility (~10,000 cm^2/(V s)) and large, nonsaturating transverse magnetoresistance (~6000%).
Shubnikov-de Haas oscillations indicated small Fermi pockets and a possible nontrivial Berry phase.

Conclusions:

Ir2In8S is a new material system for studying topological semimetals.
Its facile synthesis and unique properties offer advancements in the field of topological materials.