PreprintCC BY 4.0arXiv
Singular high-harmonic transport above a quantum threshold
Abstract
We show that Landau-Zener tunneling in a small-gap insulator produces a singular DC current--voltage relation, and correspondingly, strong high-harmonic generation in AC transport. Remarkably, high-harmonic responses decrease subexponentially with harmonic order, which is parametrically slower than in ordinary conductors and PN diodes. We further derive a scaling law for the current amplitude at frequency nω produced by the applied electric field E at fundamental frequency ω. Our work offers a promising route to THz generation based on frequency multiplication in solids.
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BibTeX
@misc{onishi2026singular,
title = {{Singular high-harmonic transport above a quantum threshold}},
author = {Yugo Onishi and Su-Yang Xu and Liang Fu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.20990},
eprint = {2609.20990},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.20990},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Singular high-harmonic transport above a quantum threshold
AU - Yugo Onishi
AU - Su-Yang Xu
AU - Liang Fu
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.20990
UR - https://arxiv.org/abs/2609.20990
AB - We show that Landau-Zener tunneling in a small-gap insulator produces a singular DC current--voltage relation, and correspondingly, strong high-harmonic generation in AC transport. Remarkably, high-harmonic responses decrease subexponentially with harmonic order, which is parametrically slower than in ordinary conductors and PN diodes. We further derive a scaling law for the current amplitude at frequency nω produced by the applied electric field E at fundamental frequency ω. Our work offers a promising route to THz generation based on frequency multiplication in solids.
ER -