- #1
Nusc
- 760
- 2
S_z = hbar/2 [ (|+><+|)-(|-><-|) ]
Normally we're given these relations, how does one derive them?
Normally we're given these relations, how does one derive them?
Nusc said:S_z = hbar/2 [ (|+><+|)-(|-><-|) ]
Normally we're given these relations, how does one derive them?
Nusc said:There's a negative sign in front of |-><-| so its not the identity.
But (|+><+|)+(|-><-|) = 1 is.
Actually for an arbitrary set [tex]
\sum_a |a\rangle \langle a | = 1
[/tex]
|+> = ( 1 0 )^T
|-> = ( 0 1 )^T
Nusc said:What's S_x |+> and S_x |->?
Angular momentum is a physical quantity that measures the rotational motion of an object. It is the product of an object's moment of inertia and its angular velocity.
Angular momentum and linear momentum are related through the cross product of an object's position and linear momentum vectors. This relationship is described by the equation L = r x p, where L is angular momentum, r is position, and p is linear momentum.
The "z-component" of angular momentum, also known as Sz, is a specific component of angular momentum that measures the rotation of an object around the z-axis. It is a crucial concept in quantum mechanics and is used to describe the spin of particles.
The Sz expression is derived using the principles of quantum mechanics and the commutation relationship between angular momentum and its z-component. It is derived as Sz = (ħ/2)i(∂/∂θ), where ħ is the reduced Planck's constant and θ is the angle of rotation around the z-axis.
The Sz expression is significant because it provides a mathematical representation of the z-component of angular momentum. It is used in various applications in quantum mechanics, such as calculating the spin of particles and predicting the behavior of atoms and molecules. It also helps in understanding the relationship between angular momentum and its components in rotational motion.