A wide-range topological thermometer with Ta2Pd3Te5: from power-law response to application prospects

作者：Yupeng Li, Anqi Wang, Senyang Pan, Dayu Yan, Guang Yang, Xingchen Guo, Yu Hong, Zhiyuan Zhang, Ziwei Dou, Guangtong Liu, Fanming Qu, Zhijun Wang, Tian Qian, Jinglei Zhang, Youguo Shi, Lü Li, Jie Shen · 发表于：npj Quantum Materials · 年份：2026 · DOI：10.1038/s41535-026-00866-8 · 被引用次数：1 · 研究领域：Photorefractive and Nonlinear Optics、Topological Materials and Phenomena、High-pressure geophysics and materials

Abstract In recent decades, there has been a persistent pursuit of applications for surface/edge states in topological systems, driven by their dissipationless transport effects. This work demonstrates the remarkable properties of the topological material Ta 2 Pd 3 Te 5 , as a thermometer. At low temperatures, it shows a power-law correlation in temperature-dependent resistance, while behaving like a semiconductor at high temperatures. This dual behavior effectively mitigates the issue of infinite resistance in semiconductor thermometers at ultra-low temperatures, making it ideal for millikelvin-range refrigerators. Through chemical doping, thickness adjustment, and gate voltage control, its performance can be finely tuned, and can also enable micron-scale local temperature measurement from millikelvin to room temperature. Furthermore, this thermometer exhibits excellent temperature sensitivity and resolution, and can be fine-tuned to show small magnetoresistance. In summary, the Ta 2 Pd 3 Te 5 -based thermometer, also referred to as a topological thermometer, demonstrates considerable potential for broad-temperature-range detection and merits further investigation and optimization.