Quantized Andreev conductance in semiconductor nanowires

作者：Yichun Gao, Wenyu Song, Yuhao Wang, Zuhan Geng, Zhan Cao, Zehao Yu, Shuai Yang, Jiaye Xu, Fangting Chen, Zonglin Li, Ruidong Li, Lining Yang, Zhaoyu Wang, Shan Zhang, Xiao Feng, Tiantian Wang, Yunyi Zang, Lin Li, Dong E. Liu, Runan Shang, Qi‐Kun Xue, Ke He, Hao Zhang · 发表于：Physical Review Applied · 年份：2025 · DOI：10.1103/bwp9-7dsd · 被引用次数：3 · 研究领域：Advanced Memory and Neural Computing、Semiconductor materials and interfaces、Advancements in Semiconductor Devices and Circuit Design

Clean one-dimensional electron systems can exhibit quantized conductance. The plateau conductance doubles if the transport is dominated by Andreev reflection. Here, we report quantized conductance observed in both Andreev and normal-state transports in PbTe-Pb and PbTe-In hybrid nanowires. The Andreev plateau is observed at $4e^2/h$, twice of the normal plateau value of $2e^2/h$. In comparison, Andreev conductance in the best-optimized III-V nanowires is non-quantized due to mode-mixing induced dips (a disorder effect), despite the quantization of normal-state transport. The negligible mode mixing in PbTe hybrids indicates an unprecedented low-disorder transport regime for nanowire devices, beneficial for Majorana researches.