Why the electron orbit is a integer multiple of De Broglie wavelength?

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The discussion centers on the concept that electron orbits should be integer multiples of the De Broglie wavelength for stability. It questions the relevance of traditional Bohr model orbits, emphasizing that modern quantum mechanics focuses on stable electron states or eigenstates derived from the Schrodinger equation. The wave nature of electrons suggests that for stability, the wave must be in phase with itself around the nucleus. The conversation highlights a shift away from classical orbits to a more nuanced understanding of electron behavior in quantum mechanics. Overall, the relationship between wave properties and electron stability remains a complex topic in physics.
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I cannot understand why the electron orbit should be an integer multiple of De Broglie wavelength. Why should the wave path "fit" the electron orbit for it to be stationary?
 
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When you say "electron path", and "orbit", I suspect you are thinking in thinking in terms of the Bohr atom, but the Bohr atom with an orbiting electron is no longer considered a good description. To solve the Schrodinger equation, we are looking for a stable electron state, or eigenstate. Orbits are not a part of this picture.
 
These papers by Pegg et al. (doi: 10.1016/j.shpsb.2008.02.003 [section 4]; https://www.researchgate.net/publication/230928426_Retrodiction_in_quantum_optics [section 3.2]) seem to show that photon Bell correlations can be inferred using quantum theory in a manner that is compatible with locality by performing quantum retrodiction (i.e. inferring information about the past: e.g. https://doi.org/10.3390/sym13040586; more papers at end) where they evolve backward from Alice's measured outcome...

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