Quantized Transport in Floquet Topological Insulators
Abstract
We study quantum transport in a periodically driven (Floquet) topological system coupled to static fermionic reservoirs. Using the Floquet nonequilibrium Green's-function (NEGF) formalism we show, from exact numerics for a strip geometry, that the two-terminal (longitudinal) conductance is quantized as |Wε| e2/h, while the Hall (transverse) conductance is quantized as Wε e2/h, where Wε is the Floquet winding invariant associated with the quasienergy gap at ε = 0 or ε = Ω/2. Quantization is achieved only after summing over the contribution of all Floquet sidebands. We provide an analytic understanding of this Floquet conductance sum rule, by considering the Hall conductance in the weak coupling limit. In that limit, we show that the Floquet Hall conductance gets contributions from the Floquet sidebands, which includes the signs of the velocities of the edge modes. Their sum yields exact quantization, as predicted by the Floquet sum rule. We find that in a wide range of parameter regime, the convergence is fast, making observation of the sum rule and Floquet winding numbers accessible to experiments.
Versions
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BibTeX
@misc{kumari2026quantized,
title = {{Quantized Transport in Floquet Topological Insulators}},
author = {Rekha Kumari and Manas Kulkarni and Abhishek Dhar},
howpublished = {arXiv},
year = {2026},
month = may,
doi = {10.48550/arxiv.2605.13066},
eprint = {2605.13066},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.13066},
}
RIS
TY - UNPB
TI - Quantized Transport in Floquet Topological Insulators
AU - Rekha Kumari
AU - Manas Kulkarni
AU - Abhishek Dhar
PY - 2026
DA - 2026/05/13
PB - arXiv
DO - 10.48550/arxiv.2605.13066
UR - https://arxiv.org/abs/2605.13066
AB - We study quantum transport in a periodically driven (Floquet) topological system coupled to static fermionic reservoirs. Using the Floquet nonequilibrium Green's-function (NEGF) formalism we show, from exact numerics for a strip geometry, that the two-terminal (longitudinal) conductance is quantized as |W_ε| e^2/h, while the Hall (transverse) conductance is quantized as W_ε e^2/h, where W_ε is the Floquet winding invariant associated with the quasienergy gap at ε = 0 or ε = Ω/2. Quantization is achieved only after summing over the contribution of all Floquet sidebands. We provide an analytic understanding of this Floquet conductance sum rule, by considering the Hall conductance in the weak coupling limit. In that limit, we show that the Floquet Hall conductance gets contributions from the Floquet sidebands, which includes the signs of the velocities of the edge modes. Their sum yields exact quantization, as predicted by the Floquet sum rule. We find that in a wide range of parameter regime, the convergence is fast, making observation of the sum rule and Floquet winding numbers accessible to experiments.
ER -