Cavity-tunable Pseudospin-Hall Topology and Edge Transport
Abstract
Topological edge states are a hallmark of topological phases, with their existence tied to bulk band topology through bulk-edge correspondence. In photonic pseudospin-Hall systems, these states exhibit pseudospin-momentum locking, with lattice interactions and interface geometry determining each pseudospin's propagation direction. Reversing the pseudospin-dependent propagation direction without altering the lattice configuration or excitation handedness remains a fundamental challenge in controlling topological edge transport. Here, we theoretically and experimentally demonstrate cavity-tunable topological edge transport in a microwave metasurface embedded within a metallic cavity. Varying the cavity height reshapes resonator interactions, driving band inversion and topological phase transition while preserving the lattice geometry. For a fixed domain-wall configuration, this transition reverses the propagation direction associated with each pseudospin while preserving pseudospin-momentum locking. Excitations with the same handedness are observed to launch edge waves propagating in opposite directions at their respective edge-band frequencies determined by the cavity height. These results establish cavity electrodynamics as an external means of controlling the bulk topology and reconfiguring the directional response of topological interfaces, creating new opportunities for topological wave routing in fixed photonic lattice structures.
Related
- Pseudospin Hall Transport Induced by Berry Curvature
- Non-Hermitian Topology from Edge Transport in Hermitian Quantum Anomalous Hall Systems
- Large nonlinear Hall effect in strained moiré structures hosting pseudospin-3/2 fermions
- Observation of pseudospin-locked chiral edge transport in gyromagnetic photonic crystals
- Bicircular light tunable topological phases and nonlinear Hall responses in odd-parity magnets
BibTeX
@misc{niu2026cavitytunable,
title = {{Cavity-tunable Pseudospin-Hall Topology and Edge Transport}},
author = {Minghui Niu and Yan Meng and Chengle Fan and Xiaoyuan Jiao and Jidong Song and Perry Ping Shum and Zhen Gao and Mengyao Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.20343},
eprint = {2610.20343},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.20343},
}
RIS
TY - UNPB
TI - Cavity-tunable Pseudospin-Hall Topology and Edge Transport
AU - Minghui Niu
AU - Yan Meng
AU - Chengle Fan
AU - Xiaoyuan Jiao
AU - Jidong Song
AU - Perry Ping Shum
AU - Zhen Gao
AU - Mengyao Li
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.20343
UR - https://arxiv.org/abs/2610.20343
AB - Topological edge states are a hallmark of topological phases, with their existence tied to bulk band topology through bulk-edge correspondence. In photonic pseudospin-Hall systems, these states exhibit pseudospin-momentum locking, with lattice interactions and interface geometry determining each pseudospin's propagation direction. Reversing the pseudospin-dependent propagation direction without altering the lattice configuration or excitation handedness remains a fundamental challenge in controlling topological edge transport. Here, we theoretically and experimentally demonstrate cavity-tunable topological edge transport in a microwave metasurface embedded within a metallic cavity. Varying the cavity height reshapes resonator interactions, driving band inversion and topological phase transition while preserving the lattice geometry. For a fixed domain-wall configuration, this transition reverses the propagation direction associated with each pseudospin while preserving pseudospin-momentum locking. Excitations with the same handedness are observed to launch edge waves propagating in opposite directions at their respective edge-band frequencies determined by the cavity height. These results establish cavity electrodynamics as an external means of controlling the bulk topology and reconfiguring the directional response of topological interfaces, creating new opportunities for topological wave routing in fixed photonic lattice structures.
ER -