3 papers
quant-ph2026
Tuning topological phases and exceptional points in a non-Hermitian Rice Mele model beyond nearest neighbors
Carolina Martinez-Strasser, Dario Bercioux, Nico Leumer
Exceptional points are degeneracies characteristic of non-Hermitian operators, where eigenvalues and eigenvectors coalesce, rendering the Hamiltonian defective. We investigate the…
cond-mat.mes-hall2026
Transcendental momentum quantization in semiconducting Rashba nanowires and zero energy states in their normal and superconducting phase
Nico Leumer, Harald Schmid, Milena Grifoni +1
We study finite system properties of the canonical low energy model for a semiconducting nanowire with Rashba spin-orbit coupling. The case of an isolated wire as well as of one pr…
quant-ph2025
Impurity-induced counter skin-effect and linear modes in non-Hermitian systems
Nico G. Leumer, Dario Bercioux
Non-reciprocal lattice systems are among the simplest non-Hermitian systems, exhibiting several key features absent in their Hermitian counterparts. In this study, we investigate t…