Concurrent Terahertz Spin Excitations and Phase Shift Control in Fe 4 Nb 2 O 9 : A Material for Synergizing Computation and Communication Technologies
Abstract
Driven by escalating demands from emerging applications and inherent limitations of current technologies, terahertz (THz) science has surged as a cornerstone for 6G+ communication systems and magnonic computation. Phase shifters, essential for THz wave manipulation, drive communication advances, while magnons enable ultrafast, energy‐efficient processing. Ideally, a multifunctional material co‐hosting both would integrate these fields towards lab‐on‐a‐chip applications; yet, no such experimental realization exists. Herein, a novel platform is presented to integrate intrinsic THz phase shifting and spin excitations within a single material system. Fe 4 Nb 2 O 9 , selected as a model compound, demonstrates a remarkable intrinsic phase‐shift of 304.7° at around 0.5 THz in the temperature range of 30–93 K. This gigantic effect either matches or surpasses the existing metasurface‐based free‐space THz phase shifters − with a correlated phase‐frequency relationship across a wide sub‐THz bandwidth (0.1 to 0.56 THz). The experimental results, corroborated by theoretical lattice vibration calculations, attribute the observed THz phase‐shift to dielectric modulation in Fe 4 Nb 2 O 9 . Complementing these findings, two distinct THz magnon excitations were detected above 0.56 THz in its antiferromagnetic phase. This unique coexistence of phase modulation and spin dynamics positions Fe 4 Nb 2 O 9 as a paradigmatic multifunctional material‐a model compound for next‐generation miniaturized THz communication and computation platforms.
Related
- Towards exascale fully relativistic pseudopotential density functional theory calculations enabled by mixed-precision computation and compressed-communication using residual based subspace iteration
- The Breakdown of Classical Minicrypt Equivalences in the Quantum-Computation Classical-Communication Model
- Collective charge excitations in the kagome lattice driven by Holstein phonons and magnetic fields
- Emergence of nonequilibrium Lieb excitations in periodically-driven strongly-interacting bosons
- A large size of the pion-like excitations in the stringy fluid above Tch is model independent and required by current algebra
BibTeX
@article{mehra2026concurrent,
title = {{Concurrent Terahertz Spin Excitations and Phase Shift Control in Fe 4 Nb 2 O 9 : A Material for Synergizing Computation and Communication Technologies}},
author = {Brijesh Singh Mehra and Karan Datt Sharma and Sanjeev Kumar and Gaurav Dubey and Mitanshi Gupta and Ravi Shankar Singh and Dibakar Roy Chowdhury and Christine Martin and Antoine Maignan and Kiran Singh and Dhanvir Singh Rana},
journal = {Advanced Science},
year = {2026},
month = may,
doi = {10.1002/advs.75555},
url = {https://hal.science/hal-05843602v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Concurrent Terahertz Spin Excitations and Phase Shift Control in Fe 4 Nb 2 O 9 : A Material for Synergizing Computation and Communication Technologies
AU - Brijesh Singh Mehra
AU - Karan Datt Sharma
AU - Sanjeev Kumar
AU - Gaurav Dubey
AU - Mitanshi Gupta
AU - Ravi Shankar Singh
AU - Dibakar Roy Chowdhury
AU - Christine Martin
AU - Antoine Maignan
AU - Kiran Singh
AU - Dhanvir Singh Rana
PY - 2026
DA - 2026/05/13
JO - Advanced Science
DO - 10.1002/advs.75555
UR - https://hal.science/hal-05843602v1
AB - Driven by escalating demands from emerging applications and inherent limitations of current technologies, terahertz (THz) science has surged as a cornerstone for 6G+ communication systems and magnonic computation. Phase shifters, essential for THz wave manipulation, drive communication advances, while magnons enable ultrafast, energy‐efficient processing. Ideally, a multifunctional material co‐hosting both would integrate these fields towards lab‐on‐a‐chip applications; yet, no such experimental realization exists. Herein, a novel platform is presented to integrate intrinsic THz phase shifting and spin excitations within a single material system. Fe 4 Nb 2 O 9 , selected as a model compound, demonstrates a remarkable intrinsic phase‐shift of 304.7° at around 0.5 THz in the temperature range of 30–93 K. This gigantic effect either matches or surpasses the existing metasurface‐based free‐space THz phase shifters − with a correlated phase‐frequency relationship across a wide sub‐THz bandwidth (0.1 to 0.56 THz). The experimental results, corroborated by theoretical lattice vibration calculations, attribute the observed THz phase‐shift to dielectric modulation in Fe 4 Nb 2 O 9 . Complementing these findings, two distinct THz magnon excitations were detected above 0.56 THz in its antiferromagnetic phase. This unique coexistence of phase modulation and spin dynamics positions Fe 4 Nb 2 O 9 as a paradigmatic multifunctional material‐a model compound for next‐generation miniaturized THz communication and computation platforms.
SN - 2198-3844
ER -