Conductance quantization in PbTe nanowires

Song，Wenyu1; Wang，Yuhao1; Miao，Wentao1; Yu，Zehao1; Gao，Yichun1; Li，Ruidong1; Yang，Shuai1; Chen，Fangting1; Geng，Zuhan1; Zhang，Zitong1; Zhang，Shan1; Zang，Yunyi2,3; Cao，Zhan2; Liu，Dong E.1,2,3,4; Shang，Runan2,3; Feng，Xiao1,2,3,4; Li，Lin2; Xue，Qi Kun1,2,3,4,5; He，Ke1,2,3,4; Zhang，Hao1,2,4

2023-07-15

10.1103/PhysRevB.108.045426

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

PbTe nanowires coupled to a superconductor have recently been proposed as a potential Majorana platform. The hallmark of the one-dimensional nature of ballistic nanowires is their quantized conductance. Here, we report the observation of conductance plateaus at multiples of the quantized value 2e2/h in PbTe nanowires at finite magnetic fields. The quantized plateaus, as a function of source-drain bias and magnetic field, allow for the extraction of the Landé g factor, sub-band spacing, and effective mass. The coefficient of 2 in the plateau conductance indicates the presence of valley degeneracy arising from the crystal orientation of the nanowires, which are grown on a (001) substrate. Occasionally, this degeneracy can be lifted by a gate voltage that breaks the mirror symmetry. Our results demonstrate the one dimensionality of PbTe nanowires and fulfill one of the necessary conditions for the realization of Majorana zero modes.

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PHYSICS

2-s2.0-85166732741

Scopus

1.State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
3.Hefei National Laboratory,Hefei,230088,China
4.Frontier Science Center for Quantum Information,Beijing,100084,China
5.Southern University of Science and Technology,Shenzhen,518055,China

Song，Wenyu,Wang，Yuhao,Miao，Wentao,et al. Conductance quantization in PbTe nanowires[J]. Physical Review B,2023,108(4).

Song，Wenyu.,Wang，Yuhao.,Miao，Wentao.,Yu，Zehao.,Gao，Yichun.,...&Zhang，Hao.(2023).Conductance quantization in PbTe nanowires.Physical Review B,108(4).

Song，Wenyu,et al."Conductance quantization in PbTe nanowires".Physical Review B 108.4(2023).