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Updated: Dec 7, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
Non-Hermitian Band Topology and Skin Modes in Active Elastic Media
Colin Scheibner1,2, William T M Irvine1,2,3, Vincenzo Vitelli1,2
1James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.
Abstract:
Solids built out of active components can exhibit nonreciprocal elastic coefficients that give rise to non-Hermitian wave phenomena. Here, we investigate non-Hermitian effects present at the boundary of two-dimensional active elastic media obeying two general assumptions: their microscopic forces conserve linear momentum and arise only from static deformations. Using continuum equations, we demonstrate the existence of the non-Hermitian skin effect in which the boundary hosts an extensive number of localized modes. Furthermore, lattice models reveal non-Hermitian topological transitions mediated by exceptional rings driven by the activity level of individual bonds.
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