Hamiltonian being a function of either orbital and spin operators

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SUMMARY

The discussion centers on the challenge of finding eigenvalues and eigenfunctions of the Hamiltonian when it involves both orbital and spin operators. The Hamiltonian is expressed as H = \vec{L}\cdot\vec{S}, where \vec{L} represents orbital angular momentum and \vec{S} denotes spin operators. The complete state space is described as the Cartesian product of the orbital state space and the spin state space, with the Hamiltonian acting on this combined space. The states are represented as products of a spatial wavefunction and a spinor, specifically \vert\psi\rangle\vert\chi\rangle.

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  • Knowledge of spin operators in quantum mechanics
  • Concept of state space in quantum systems
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  • Study the mathematical formulation of Hamiltonians involving both orbital and spin operators
  • Learn about the Cartesian product of Hilbert spaces in quantum mechanics
  • Explore examples of Hamiltonians with mixed operators, such as H = \vec{L}\cdot\vec{S}
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Quantum mechanics students, physicists working on angular momentum problems, and researchers studying Hamiltonian systems involving both orbital and spin interactions.

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Homework Statement


The title presents my problem. I know in principle how to find eigenvalues and eigenfunctions of the Hamiltonian if it depends only on orbital operators or in spin operators. On the other hand I have no clue how to solve it if there are both types of operators.


The Attempt at a Solution


The complete state space will be the cartesian (or direct?!) product of the orbital state space with the spin state space. Nevertheless, I have no idea how the hamiltonian will act on that complete space.
 
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Are you talking about something like this?
H = \vec{L}\cdot\vec{S}
In that case, as you said, you represent the states as products of a spatial wavefunction with a spinor,
\vert\psi\rangle\vert\chi\rangle
The orbital angular momentum acts on only the spatial wavefunction \vert\psi\rangle and the spin operator acts on only the spinor \vert\chi\rangle.
H\vert\psi\rangle\vert\chi\rangle = \bigl(\vec{L}\vert\psi\rangle\bigr)\cdot\bigl(\vec{S}\vert\chi\rangle\bigr)

If you have a particular example in mind, why don't you post it.
 

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