Spectral analysis of sheared nanoribbons

TL;DR

This paper analyzes the spectral properties of the Dirichlet Laplacian in a sheared nanoribbon modeled as a strip deformed by translation along a curve, identifying conditions for essential spectrum and discrete eigenvalues.

Contribution

It introduces a new shearing deformation model for nanoribbons and provides conditions for the spectrum's essential and discrete parts, including stability and Hardy inequalities.

Findings

Located the essential spectrum under specific geometric conditions.

Established conditions for the existence of discrete eigenvalues.

Derived Hardy-type inequalities in the repulsive shearing regime.

Abstract

We investigate the spectrum of the Dirichlet Laplacian in a unbounded strip subject to a new deformation of "shearing": the strip is built by translating a segment oriented in a constant direction along an unbounded curve in the plane. We locate the essential spectrum under the hypothesis that the projection of the tangent vector of the curve to the direction of the segment admits a (possibly unbounded) limit at infinity and state sufficient conditions which guarantee the existence of discrete eigenvalues. We justify the optimality of these conditions by establishing a spectral stability in opposite regimes. In particular, Hardy-type inequalities are derived in the regime of repulsive shearing.