Gate-tunable subband degeneracy in semiconductor nanowires

Abstract

Degeneracy and symmetry have a profound relation in quantum systems. Here, we report gate-tunable subband degeneracy in PbTe nanowires with a nearly symmetric cross-sectional shape. The degeneracy is revealed in electron transport by the absence of a quantized plateau. Utilizing a dual gate design, we can apply an electric field to lift the degeneracy, reflected as emergence of the plateau. This degeneracy and its tunable lifting were challenging to observe in previous nanowire experiments, possibly due to disorder. Numerical simulations can qualitatively capture our observation, shedding light on device parameters for future applications.

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Cited by in corpus (7)

• SQUID oscillations in PbTe nanowire networks
• Reducing disorder in PbTe nanowires for Majorana research
• Quantized Andreev conductance in semiconductor nanowires
• Anisotropy of PbTe nanowires with and without a superconductor
• Ab initio study of Proximity-Induced Superconductivity in PbTe/Pb heterostructures
• Strong enhancement of g-factor in PbTe-Pb hybrid nanowires
• Presence versus absence of charging energies in PbTe quantum dots