Evanescent Electron Wave Spin
- URL: http://arxiv.org/abs/2309.17325v3
- Date: Wed, 25 Oct 2023 14:29:33 GMT
- Title: Evanescent Electron Wave Spin
- Authors: Ju Gao and Fang Shen
- Abstract summary: We show that an evanescent electron wave exists outside both finite and infinite quantum wells.
We demonstrate that the evanescent wave spins concurrently with the wave inside the quantum well.
Our findings suggest that it is possible to probe or eavesdrop on quantum spin information through the evanescent wave spin.
- Score: 3.517233208696288
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Our study shows that an evanescent electron wave exists outside both finite
and infinite quantum wells, by solving exact solutions of the Dirac equation in
a cylindrical quantum well and maintaining wavefunction continuity at the
boundary. Furthermore, we demonstrate that the evanescent wave spins
concurrently with the wave inside the quantum well, by deriving analytical
expressions of the current density in the whole region. Our findings suggest
that it is possible to probe or eavesdrop on quantum spin information through
the evanescent wave spin without destroying the entire spin state. The wave
spin picture interprets spin as a global and deterministic property of the
electron wave that includes both the evanescent and confined wavefunctions.
This suggests that a quantum process or device based on the manipulation and
probing of the electron wave spin is deterministic in nature rather than
probabilistic.
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