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Intrinsic large gap quantum anomalous Hall insulators in LaX (X = Br,Cl,I)

Dolui, Kapildeb and Ray, Sujay and Das, Tanmoy (2015) Intrinsic large gap quantum anomalous Hall insulators in LaX (X = Br,Cl,I). In: PHYSICAL REVIEW B, 92 (20).

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Official URL: http://dx.doi.org/ 10.1103/PhysRevB.92.205133


We report a theoretical prediction of a new class of bulk and intrinsic quantum anomalous Hall (QAH) insulators LaX (X=Br, Cl, and I) via relativistic first-principles calculations. We find that these systems are innate long-ranged ferromagnets which, with the help of intrinsic spin-orbit coupling, become QAH insulators. A low-energy multiband tight-binding model is developed to understand the origin of the QAH effect. Finally, integer Chern number is obtained via Berry phase computation for each two-dimensional plane. These materials have the added benefit of a sizable band gap of as large as similar to 25 meV, with the flexibility of enhancing it to above 75 meV via strain engineering. The synthesis of LaX materials will provide the impurity-free single crystals and thin-film QAH insulators for versatile experiments and functionalities.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Jan 2016 09:17
Last Modified: 02 Jan 2016 09:17
URI: http://eprints.iisc.ac.in/id/eprint/53004

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