Electronic structures near unmovable nodal points and lines in two-dimensional materials
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Physics A: Mathematical and Theoretical"
DOI: 10.1088/1751-8121/accf51
Abstract: Unmovable nodal points (UNPs) and lines (UNLs) are band crossings whose positions in the Brillouin zone are unaltered by symmetry preserving perturbations. Not only positions but also the band structure in their vicinity are determined… read more here.
Keywords: electronic structures; two dimensional; unmovable nodal; structures near ... See more keywords
Topological nodal points in two coupled Su-Schrieffer-Heeger chains
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review B"
DOI: 10.1103/physrevb.96.125418
Abstract: We study two coupled Su-Schrieffer-Heeger (SSH) chains system, which is shown to contain rich quantum phases associated with topological invariants protected by symmetries. In the weak coupling region, the system supports two non-trivial topological insulating… read more here.
Keywords: two coupled; schrieffer heeger; topological nodal; nodal points ... See more keywords
Nodal points of Weyl semimetals survive the presence of moderate disorder
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review B"
DOI: 10.1103/physrevb.98.205134
Abstract: In this work we address the physics of individual three dimensional Weyl nodes subject to a moderate concentration of disorder. Previous analysis indicates the presence of a quantum phase transition below which disorder becomes irrelevant… read more here.
Keywords: semimetals survive; weyl semimetals; points weyl; presence ... See more keywords
Reconstruction of the Volterra-type integro-differential operator from nodal points
Sign Up to like & getrecommendations! Published in 2018 at "Boundary Value Problems"
DOI: 10.1186/s13661-018-0968-0
Abstract: In this work, the Sturm–Liouville problem perturbated by a Volterra-type integro-differential operator is studied. We give a uniqueness theorem and an algorithm to reconstruct the potential of the problem from nodal points (zeros of eigenfunctions). read more here.
Keywords: differential operator; integro differential; type integro; volterra type ... See more keywords
Nodal points and the eye.
Sign Up to like & getrecommendations! Published in 2022 at "Applied optics"
DOI: 10.1364/ao.455464
Abstract: Nodal points are defined using parallel object and image rays at very small angles to the optical axis, and Johann Listing described them when characterizing the eye in 1845. They are only distinct from principal… read more here.
Keywords: eye; nodal points; image; points eye ... See more keywords