Eigenfunctions of spin operator

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Discussion Overview

The discussion centers on the eigenfunctions of spin operators, particularly in the context of quantum mechanics. Participants explore the mathematical formulation of spin operators, their eigenvalues, and the nature of eigenfunctions associated with these operators.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the eigenfunctions of spin operators, noting familiarity with the eigenvalues and eigenvectors but lacking clarity on the eigenfunctions themselves.
  • Another participant suggests that the term "spin spherical harmonics" may refer to the functions representing finite rotations in spin space, drawing a parallel to spherical harmonics.
  • A participant reiterates their confusion regarding the eigenfunctions, emphasizing their understanding of the eigenvalues and eigenvectors of the Pauli matrices but not the eigenfunctions.
  • One participant clarifies that the spin space is an abstract finite-dimensional vector space, indicating that there are no traditional wavefunctions, but rather matrices.
  • A later reply distinguishes between the Pauli matrices as generators and the matrix functions that represent finite rotations, asserting that these functions are dependent on Euler angles and are eigenfunctions of the spin operators.

Areas of Agreement / Disagreement

Participants express differing views on the nature of eigenfunctions related to spin operators, with no consensus reached on a definitive understanding or terminology.

Contextual Notes

There is ambiguity regarding the definitions and interpretations of eigenfunctions in the context of spin operators, as well as the relationship between these functions and the Pauli matrices.

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What are the eigenfunctions of the spin operators? I know the spin operators are given by Pauli matricies (https://en.wikipedia.org/wiki/Spin_operator#Mathematical_formulation_of_spin), and I know what the eigenvalues are (and the eigenvectors), but I have no idea what the eigenfunctions of the spin operator are. I searched google but I could not find a derivation. Does anyone know how to find the eigenfunctions of the spin operator?
 
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Do you mean spin spherical harmonics? These are the functions that represent finite rotations in spin space, half-integer analogs to the Ylm's. They're briefly mentioned in Wikipedia, covered more in this article, and especially in books on angular momentum, like the monograph by Edmonds.
 
Like the Pauli matricies Sx, Sy, Sz, I know the eigenvalues/eigenvectors, but what are the eigenfunctions? I have no idea what they could be.
 
The spin space is an abstract finite dimensional (essentially C^(2s+1)) vector space. There are no <wavefunctions>, just normal quadratic matrices and matrices with one column.
 
Like the Pauli matricies Sx, Sy, Sz, I know the eigenvalues/eigenvectors, but what are the eigenfunctions?
No, NOT like the Pauli matrices. The Pauli matrices are the generators. I'm referring to the matrix functions that represent finite rotations. They are functions in the sense that they are functions of the three Euler angles. And they are eigenfunctions of S and Sz.
 

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