Sublattice-selective control of spin reversal in metasurface-coupled Kagome interfaces
Abstract
Coherent manipulation of photonic interface states requires a control field that matches their internal mode structure. We study this requirement in a two-component Kagome lattice motivated by photon-mediated exchange near a nonlinear nonlocal metasurface. The Dirac spinors show why uniform Raman control cannot couple opposite-spin, same-valley interface modes at leading order, even when their spatial envelopes coincide. A 1:1:−2 sublattice pattern removes this cancellation and maximizes the projected coupling at fixed root-mean-square amplitude within the diagonal-control class. We test this control scheme through full-zone topology and complete lattice propagation. For a smooth, gapped interface, a $720$-dimensional calculation gives target-mode fidelity $0.999937$ with leakage 6.27×10−5 at RMS drive 0.04t. Trace-preserving dynamics gives the separate survival condition needed for successful conversion. An exploratory three-dimensional lithium-niobate supercell reproduces the complex addressing pattern with 0.373% relative error and provides nonlocal exchange, decay and electro-optic frequency-conversion matrices. The mode-resolved control principle thus gives quantitative electromagnetic design targets; the full spin-dependent device realization still requires further calibration.
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BibTeX
@misc{wang2026sublatticeselective,
title = {{Sublattice-selective control of spin reversal in metasurface-coupled Kagome interfaces}},
author = {Ximo Wang and Qiwei Han and Zhenqi Bai and Ruyue Guo and Min Feng and Yichi Zhang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.18012},
eprint = {2609.18012},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.18012},
}
RIS
TY - UNPB
TI - Sublattice-selective control of spin reversal in metasurface-coupled Kagome interfaces
AU - Ximo Wang
AU - Qiwei Han
AU - Zhenqi Bai
AU - Ruyue Guo
AU - Min Feng
AU - Yichi Zhang
PY - 2026
DA - 2026/09/16
PB - arXiv
DO - 10.48550/arxiv.2609.18012
UR - https://arxiv.org/abs/2609.18012
AB - Coherent manipulation of photonic interface states requires a control field that matches their internal mode structure. We study this requirement in a two-component Kagome lattice motivated by photon-mediated exchange near a nonlinear nonlocal metasurface. The Dirac spinors show why uniform Raman control cannot couple opposite-spin, same-valley interface modes at leading order, even when their spatial envelopes coincide. A 1:1:−2 sublattice pattern removes this cancellation and maximizes the projected coupling at fixed root-mean-square amplitude within the diagonal-control class. We test this control scheme through full-zone topology and complete lattice propagation. For a smooth, gapped interface, a $720$-dimensional calculation gives target-mode fidelity $0.999937$ with leakage 6.27×10^−5 at RMS drive 0.04t. Trace-preserving dynamics gives the separate survival condition needed for successful conversion. An exploratory three-dimensional lithium-niobate supercell reproduces the complex addressing pattern with 0.373% relative error and provides nonlocal exchange, decay and electro-optic frequency-conversion matrices. The mode-resolved control principle thus gives quantitative electromagnetic design targets; the full spin-dependent device realization still requires further calibration.
ER -