Orbital cancellation and reentrant localization in a quasiperiodic trimer ladder
Abstract
Uniform orbital detuning can restore spatial extent even as quasiperiodic modulation strengthens. In a trimer ladder with fixed hoppings and orbital modulation signs, increasing detuning and modulation amplitude together drives successive avoided crossings that redistribute orbital weights, suppressing the projected onsite potential in both lower molecular bands while leaving the third strongly modulated. Complete-band participation scaling supports two reentrant high-participation windows, with wave-packet propagation corroborating spatial recovery at representative controls over the studied sizes and times. These diagonal cancellations leave residual interband modulation, which generates a self-energy whose magnitude depends on the molecular level separation. Gaussian quadrature improves convergence of closed-walk determinant estimates used to cross-check energy-resolved attenuation. Comparing the coupled and decoupled ladders under the same finite-size participation criterion shows that restoring the full off-diagonal modulation narrows both sampled windows, with a larger absolute contraction of the second.
Related
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BibTeX
@misc{wang2026orbital,
title = {{Orbital cancellation and reentrant localization in a quasiperiodic trimer ladder}},
author = {Xin Wang and Pei-Jie Chang and Quanfeng Lu and Muxi Zheng and Dong Ruan and Gui-Lu long},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.16197},
eprint = {2610.16197},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.16197},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Orbital cancellation and reentrant localization in a quasiperiodic trimer ladder
AU - Xin Wang
AU - Pei-Jie Chang
AU - Quanfeng Lu
AU - Muxi Zheng
AU - Dong Ruan
AU - Gui-Lu long
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2610.16197
UR - https://arxiv.org/abs/2610.16197
AB - Uniform orbital detuning can restore spatial extent even as quasiperiodic modulation strengthens. In a trimer ladder with fixed hoppings and orbital modulation signs, increasing detuning and modulation amplitude together drives successive avoided crossings that redistribute orbital weights, suppressing the projected onsite potential in both lower molecular bands while leaving the third strongly modulated. Complete-band participation scaling supports two reentrant high-participation windows, with wave-packet propagation corroborating spatial recovery at representative controls over the studied sizes and times. These diagonal cancellations leave residual interband modulation, which generates a self-energy whose magnitude depends on the molecular level separation. Gaussian quadrature improves convergence of closed-walk determinant estimates used to cross-check energy-resolved attenuation. Comparing the coupled and decoupled ladders under the same finite-size participation criterion shows that restoring the full off-diagonal modulation narrows both sampled windows, with a larger absolute contraction of the second.
ER -