Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session D14: Dirac and Weyl Semimetals: Theory II
3:00 PM–5:48 PM,
Monday, March 4, 2024
Room: M100E
Sponsoring
Unit:
DCMP
Chair: Yuxin Wang, Florida State University
Abstract: D14.00009 : Geometry-Enforced Topological Chiral Fermions in Amorphous Chiral Metals*
4:36 PM–4:48 PM
Presenter:
Justin Schirmann
(CNRS - Neel Institute)
Authors:
Justin Schirmann
(CNRS - Neel Institute)
Adolfo G Grushin
(CNRS - Neel Institute)
Benjamin J Wieder
(Université Paris-Saclay)
However outside of the limit of perfect translation symmetry, especially among the numerous experimentally accessible amorphous materials in nature, it remains an open question whether there similarly exist mechanisms for generating and identifying topologically chiral nodal degeneracies.
We present extensive analytic and numerical calculations demonstrating the existence of multitudinous chiral fermions in amorphous metals, whose degeneracy and chiral charges are tunable via the interplay of average symmetry and geometry.
We introduce an amorphous Wilson-loop numerical method to, for the first time, characterize chiral fermions with quantized Berry curvature fluxes in fully disordered 3D metals.
We further analyze the role of disorder on the bulk-boundary correspondence and response.
Our findings indicate a clear route towards engineering geometry-enforced topology in non-crystalline materials and metamaterials.
*J. S. is supported by the program QuanTEdu-France n° ANR-22-CMAS-0001 France 2030. B.J.W. acknowledges financial support from the European Research Council (ERC) Starting grant under grant agreement No. 101117835 (TopoRosetta). A.G.G. acknowledges financial support from the European Research Council (ERC) Consolidator grant under grant agreement No. 101042707 (TOPOMORPH).
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