# Questions tagged [quantum-spin]

Fundamental characteristic property of particles which together with orbital angular momentum acts as the generator of rotations and which doesn't have a classical equivalent but is sometimes compared to and contrasted with classical intrinsic angular momentum.

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### Addition of angular momenta for three distinguishable spin 1/2 particles - identifying eigenfunctions

Variants of this question have been asked before, and techniques for deriving all 8 eigenstates of the total system have been provided, most clearly in this post: Adding 3 electron spins My question ...
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### Symmetry of Wave- Function and Spin

Bosons have integral spins and so the total wave-function of a Bosonic system should fundamentally be symmetric under particle exchange. Fermions have half-integral spins and so the total wave-...
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### Instrinsic spin orbit coupling in tight-binding Hamiltonian

I'm looking to write down a second quantized Hamiltonian to include the intrinsic spin-orbit coupling term in addition to the hopping spin-orbit coupling Rashba effect. How would I construct the term ...
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### Symmetrisation of (fermionic) two-particle system without vs. with spin in wave function

I'm using D. J. Griffiths's textbook Introduction to Quantum Mechanics (3rd ed.) for my introductory university course on the subject. In chapter 5 (starting at section 5.1.1), he discusses the ...
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### Calculating the spin given the baryon wave function

This is probably a trivial question and I am missing something conceptually simple here. I have the spin part of the total wave function of a baryon consisting of three light quarks: \begin{equation}...
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### Proof of quantum superposition

My question is really very simple, how can one see that a spin 1/2 particle in a definite projection in z(say, up) is in a superposition of Sx states?
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### Stern-Gerlach experiment for spin-1 particles

If we have a beam of spin-1 particles and let them pass through a Stern-Gerlach apparatus (oriented along z-axis, we get three output beams. Suppose we now take only the $+\hbar$ beam and pass it ...
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### What is residual interaction physically?

In any nuclei, if it is even-even or odd-even we can determine ground state spin and parity just by single particle shell model. But if in a odd-odd nuclei, we consider residual interaction to ...
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### Photon nonzero Spin (Helicity?)

I had a simple question - how many different values can a photon present for spin angular momentum, given that it's spin is 1? And although I immediately thought "3, since j = 2s + 1" (j being the ...
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### Electric dipole transitions with and without spin-orbit interaction

I have a question, using the following energy levels: I am under the impression here that the possible electric dipole transitions are $4s \to 4p, 4p \to 5s, 4p \to 3d$ and vice versa obeying the ...
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### Why is $L$-$S$ Coupling Dominant in Lower Atomic Number like Carbon and Silicon and $J$-$J$ in higher like Germanium and Arsenic?

Furthermore, a) Why is the order of domination in $L$-$S$ coupling: Spin-Spin correlation Residual Interaction Spin-Orbit Interaction b) While the order in $J$-$J$ coupling is: Spin-orbit ...
As we know, the dispersion of spin excitation (magnon/spin wave) for ferromagnetic(FM) system is quadratic as $k\rightarrow 0$, but is linear for anti-ferromagnetic(AFM) system as $k\rightarrow 0$. I ...