Quantized Andreev conductance in semiconductor nanowires
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
DOI 10.1103/bwp9-7dsd · Physical Review Applied
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Abstract
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 transport in PbTe-Pb and PbTe-In hybrid nanowires. The Andreev plateau is observed at 4e2/h, twice the normal plateau value of 2e2/h. In comparison, Andreev conductance in the best-optimized III-V nanowires is nonquantized 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 research.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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