2016年11月27日 · For a spin-1/2 particle (where here "1/2" refers to the magnitude of the spin only) like an electron, its spin state can be thought of as an arrow pointing in a particular direction; the probability of measuring +1/2 when we measure the electron's spin about a particular axis is then , where is the angle between the measurement axis and the ...

2012年2月9日 · Please help a poor stupid layman. When a particle has a spin of 1/2, what does that really mean? 1/2 of WHAT?

2021年11月5日 · Quantum spin is a fundamental property of subatomic particles, such as electrons and protons, that causes them to behave like tiny magnets. It is not the same as the physical spinning motion of an object, but rather a type of intrinsic angular momentum that cannot be directly observed.

2018年11月21日 · In summary, The spin quantum number has two possible values, 1/2 or -1/2, which represent the two possible measurement results when measuring the spin of a spin-1/2 particle. This value is associated with two quantum numbers, the magnitude and the projection on the z-axis. There are two types of particles, fermions with half-integer spin and bosons with …

2021年8月31日 · Thank you for your replies and the links from vanhees71 which I will seek out. As Peter Donis notes “you can have different particles with the same spin but different wavelength (momentum) and frequency (energy).” Indeed, and this simple formula applies only to spin one half fermions such as electrons. Yet it shows the dependency of the reduced Compton …

2024年1月22日 · In summary, the representation of a spin 1/2 quantum state involves describing the quantum state of a two-level system, commonly represented using Dirac notation (ket notation) as |ψ = α|0 + β|1 , where |0 and |1 are the basis states, and α and β are complex coefficients that determine the probability amplitudes for the system's state. The normalization …

2016年10月4日 · A photon has a spin of 1, while an electron is 1/2. I've heard it said that the electron needs to spin 720 degrees to complete a full cycle. Is there any proof that the electron is spinning 720 degrees and not just spinning 360 degrees, but at a lower harmonic of the photon-- 1/2 the photon's...

2015年6月29日 · Spin is one of the identities of a particle, just like rest mass. One can't say two different particles as having equal spin angular momentum quantum numbers, if the spins are different then so are the particles. Orbital angular momentum is a kinetical quantity of a moving body, it can always be related to the change of spatial degree of freedom.

2014年1月21日 · quantum spin vs ...spin I keep hearing people say, "comparing particle spin to a spinning top will lead you in the wrong direction." I'm curious.. what exactly is the difference between the two?

2021年6月14日 · The parameter characterizes the degree of anisotropy in the XY plane, while the D term introduces a difference in energy levels for the spin in the system. The D term is important in studying the effect of anisotropy on quantum many-body scar states, phase transitions, and ground state properties such as entanglement.