# 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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### Bell's theorem: why does correlation = cosine rule out hidden variables?

I was reading about entanglement and bell's theorem and played around with the idea. Specifically the point that the correlation of the measurement of entangled electrons at arbitrary angles is given ...
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### Can we identify configurations of the classical Heisenberg model with pure states of the spin-${1\over2}$ quantum Heisenberg model?

My background is mostly probability theory with some elementary quantum mechanics. Consider the following (very informal) "dictionary" between classical and quantum models for a particle in ...
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### Putting a boson or any other particle in a 3D potential well

I am confused as to how putting a different particle with a different spin change the equation of the particle in a 3D potential well (all of same side length). For a particle in a box, the wave ...
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### How do I experimentally figure out what the statistical operator $ρ$ is?

A general statistical operator can be expressed as a 2x2 matrix in the form of $$\left(\begin{array}{cc}p& r-ic\\ r+ic& 1-p\end{array}\right)$$ where p is probability and r and c are real ...
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### Combining spins of two particles of spin |1,0> and |1/2, 1/2>

I am trying to combine the spin of two particles. Their individual spins are: $|1,0\rangle$ and $\left|\frac{1}{2},\frac{1}{2} \right>$ Now I am told that they combine to give a total spin state ...
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### Can the magnetic moments of particles rotate due to non-uniform magnetic field in the Stern-Gerlach experiment?

Does this play any role in the splitting of particles or is this effect very little to be even considered? I am not sure, but I feel like that for a non-aligned magnetic moment, the nonuniform ...
3answers
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### Different ways to orient the spin in the same direction

I know that all electrons have quantised spin. But how can one orient all the spins of a given bunch of an electrons in the same direction? I know one way is that we pass the electrons through a ...
1answer
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### Why do photons have spin of 1 when they have no mass? [duplicate]

How can a photon have a spin of $1$ when it has no mass? Since the spin is intrinsic angular momentum, if $m = 0$, then the spin must be zero.
2answers
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### How many parameters are needed to specify a quantum state?

We have a spin state \begin{align} \ |{\Psi}\rangle=a_u|{U}\rangle+a_d|{D}\rangle \end{align} where $|U\rangle$ and $|D\rangle$ are $up$ and $down$ basis vectors, and $a_u$,$a_d$ are their complex ...
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### Magnetic field perceived by the electron

This section presents a relatively simple and quantitative description of the spin-orbit interaction for an electron bound to a hydrogen-like atom, up to first order in perturbation theory, using some ...
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### Defining particles by their commutation/anti-commutation relations

In my studies of many-body physics, I have encountered three types of particles, which can be defined based on their commutation/anti-commutation relations. Fermions, defined by raising/lowering ...
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### Is there a Relationship between thermal Hall conductivity and coplanar/non-coplanar spin?

Does the magnitude of the thermal Hall conductivity depend on whether spins are coplanar or not? Also, if you have any theoretical references, it would be helpful if you could present them.
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