PreprintCC BY 4.0arXiv
Subgap Bound States from Dynamical Impurities
Abstract
We find that a single non-magnetic dynamical impurity (e.g., a low-frequency localized "vibron" mode) induces a subgap bound state in an s-wave superconductor. A closed-form solution for the bound state energy is found as a function of the vibron frequency in the elastic scattering limit, with the salient features of the bound state energies unaffected by inelastic scattering processes in the sub-THz regime. In addition to subgap features in the low-frequency local density of states, such impurities result in real space regions of reduced spectroscopic weight outside the gap peak.
Related
- Interference-controlled magnetic bound states and subgap transport in a Square--octagon superconductor
- Bound states, resonances, and their thermodynamic properties in pseudospin-1 systems with short-range impurities
- Thresholdless dynamical instability in transverse 𝒫𝒯-symmetric scattering systems: The hidden role of bound states in the continuum
- Emergent hydrodynamic response and dynamical backreaction: Magnon bound-state propagation in a Bose-Hubbard fluid
- A Bound on the Dynamical Love Number
BibTeX
@misc{heath2026subgap,
title = {{Subgap Bound States from Dynamical Impurities}},
author = {Joshuah T. Heath},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00142},
eprint = {2609.00142},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00142},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Subgap Bound States from Dynamical Impurities
AU - Joshuah T. Heath
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.00142
UR - https://arxiv.org/abs/2609.00142
AB - We find that a single non-magnetic dynamical impurity (e.g., a low-frequency localized "vibron" mode) induces a subgap bound state in an s-wave superconductor. A closed-form solution for the bound state energy is found as a function of the vibron frequency in the elastic scattering limit, with the salient features of the bound state energies unaffected by inelastic scattering processes in the sub-THz regime. In addition to subgap features in the low-frequency local density of states, such impurities result in real space regions of reduced spectroscopic weight outside the gap peak.
ER -