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Exceptional hexagonal warping effect in multi-Weyl semimetals

Chowdhury, D and Banerjee, A and Narayan, A (2022) Exceptional hexagonal warping effect in multi-Weyl semimetals. In: Physical Review B, 105 (7).

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Official URL: https://doi.org/10.1103/PhysRevB.105.075133


Hexagonal warping (HW) in three-dimensional topological insulators is, by now, well known. We show that non-Hermitian (NH) loss/gain can generate an exceptional HW effect in double Weyl semimetals (DWSMs). This unique feature of DWSMs has distinctive effects on Fermi surface topology. Importantly, in the presence of such a k3 spin orbit coupling mimicking term, the symmetry associated with the DWSMs is changed, leading to four exceptional points, among which two are degenerate. Introducing a driving field removes this degeneracy. The combined action of the NH warping and driving parameters leads to notable effects, including merging and tuning of exceptional points. We analyze the topological nature of the generated exceptional contours by evaluating several topological invariants, such as winding number, vorticity, and NH Berry curvature. We hope that our theoretical results will initiate possible experiments exploring NH HW effects. © 2022 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to authors
Keywords: Combined actions; Driving field; Driving parameters; Exceptional points; Fermi surface topology; Hermitians; Spin-orbit couplings; Unique features; Warping effects; Warpings, Atomic physics
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 12 May 2022 06:34
Last Modified: 12 May 2022 06:34
URI: https://eprints.iisc.ac.in/id/eprint/71629

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