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Quantum Device Fabrication Process Engineering

Helical Current of Propagating Dirac Electrons and Geometric Coupling to Chiral Environments

arXiv
Authors: Ju Gao, Fang Shen

Year

2026

Paper ID

3469

Status

Preprint

Abstract Read

~2 min

Abstract Words

91

Citations

N/A

Abstract

We show that a propagating Dirac electron with intrinsic spin generically carries a real--space helical conserved current, even in the absence of orbital angular momentum. Using exact Dirac eigenstates in cylindrical confinement, we demonstrate that this helical structure possesses definite handedness, persists into evanescent regions, and is characterized by a geometric helix pitch independent of the longitudinal de Broglie wavelength. This intrinsic helical geometry enables a local geometric coupling between a propagating electron and a chiral environment, yielding chirality--dependent spin selectivity through current geometry rather than through a spin--orbit coupling term.

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  • This paper contributes to the Quantum Device Fabrication & Process Engineering research area in the Quantum Articles archive.
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  • We show that a propagating Dirac electron with intrinsic spin generically carries a real--space helical conserved current, even in the absence of orbital angular momentum.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:2601.16066 [2] arXiv https://arxiv.org/abs/2601.16066 [3] Publisher https://arxiv.org/abs/2601.16066

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