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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

Quantum-Geometry-Enabled Terahertz Rectification in the Weyl Semimetal TaP.

Wenqi Mo¹, Xuyang Lv², Bojin Zhao³

¹College of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, No. 1, Sub-Lane Xiangshan, Xihu, Hangzhou 310024, China.

|November 13, 2025

Summary

This study demonstrates terahertz current rectification in tantalum phosphide (TaP) Weyl semimetals, driven by the Berry curvature dipole. This breakthrough enables efficient, junction-free topological optoelectronics for advanced applications.

Keywords:

Berry curvature dipole Weyl semimetal heterodyne mixing nonlinear Hall effect topological optoelectronics

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Area of Science:

Condensed Matter Physics
Quantum Materials
Terahertz Photonics

Background:

Noncentrosymmetric crystals rectify light via Berry-curvature dipole (BCD) for direct current (DC) generation, especially with terahertz (THz) photons.
Topological Weyl semimetals (WSMs) offer ideal platforms due to large Berry curvature and broken inversion symmetry, but experimental BCD-driven THz photoresponse is challenging.

Purpose of the Study:

To experimentally demonstrate room-temperature, junction-free THz current rectification in a Weyl semimetal.
To confirm the photoresponse is explicitly driven by the intrinsic Berry curvature dipole.
To explore the potential of WSMs for high-performance THz devices.

Main Methods:

Utilized type-I Weyl semimetal tantalum phosphide (TaP) for THz current rectification experiments.
Applied transverse THz polarization to generate longitudinal photocurrents.
Characterized response time, bandwidth, and device performance as a heterodyne mixer.

Main Results:

Achieved room-temperature, junction-free THz current rectification in TaP, driven by its intrinsic BCD.
Observed longitudinal photocurrents from transverse THz polarization with a 0.96 μs response time across a 0.04-0.53 THz bandwidth.
Demonstrated a 25 dB conversion gain as a room-temperature heterodyne mixer with a 20 GHz intermediate-frequency (IF) bandwidth.

Conclusions:

Established TaP Weyl semimetals as a viable platform for topological optoelectronics.
Confirmed the direct link between Berry curvature dipole and THz photoresponse, highlighting quantum geometric effects.
Paved the way for developing high-performance THz devices for applications like 6G wireless communication.