Gate-tunable subband degeneracy in semiconductor nanowires.
basic_science · Level V
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- Record sourced from PubMed, PMID 38935562.
- Also identified by DOI 10.1073/pnas.2406884121 and PMC identifier 11228475.
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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.