Unconventional Nonreciprocal Voltage Transition in Ag_(2)Te Nanobelts  

作　　者：冷鹏亮 曹翔宇 马强 艾临风 张钰达 张警蕾 修发贤 Peng-Liang Leng;Xiang-Yu Cao;Qiang Ma;Lin-Feng Ai;Yu-Da Zhang;Jing-Lei Zhang;Fa-Xian Xiu(State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China;Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China [2]Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions,High Magnetic Field Laboratory of the Chinese Academy of Sciences,Hefei 230031,China

出　　处：《Chinese Physics Letters》2023年第12期126-130,共5页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 52225207, 11934005, and 52350001);the Shanghai Pilot Program for Basic Research-FuDan University21TQ1400100 (Grant No. 21TQ006);the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01)。

摘　　要：Nonreciprocal effects are consistently observed in noncentrosymmetric materials due to the intrinsic symmetry breaking and in high-conductivity systems due to the extrinsic thermoelectric effect. Meanwhile, nonreciprocal charge transport is widely utilized as an effective experimental technique for detecting intrinsic unidirectional electrical contributions. Here, we show an unconventional nonreciprocal voltage transition in topological insulator Ag_(2)Te nanobelts. The nonreciprocal voltage develops from nearly zero to giant values under the applied current I_(ac) and external magnetic fields, while remaining unchanged under various current I_(dc). This unidirectional electrical contribution is further evidenced by the differential resistance(dV/dI) measurements. Furthermore, the transition possesses two-dimensional properties under a tilted magnetic field and occurs when the voltage between two electrodes exceeds a certain value. We propose a possible mechanism based on the development of edge channels in Ag_(2)Te nanobelts to interpret the phenomenon. Our results not only introduce a peculiar nonreciprocal voltage transition in topological materials but also enrich the understanding of the intrinsic mechanism that strongly affects nonreciprocal charge transport.

关 键 词：VALUE reciprocal TOPOLOGICAL 

分 类 号：O469[理学—凝聚态物理]