Eigenvalue of an hamiltonian with spin

In summary, the conversation is about finding the eigenvalues of an Hamiltonian with given equations and states. The solution involves calculating the energy and determining the average value of the magnetic moment. The final conclusion is that S²z |S,M> = M² |S,M> is correct and the energy values are a+b, 0, and a-b.
  • #1
Nico045
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Homework Statement



Finding eigenvalues of an hamiltonian

Homework Equations

H = a S²z + b Sz
(hbar = 1)
what are the eigenvalues of H in |S,M> = |1,1>,|1,0>,|1,-1>

The Attempt at a Solution

H|1,1> = (a + b) |1,1>
H|1,0> = 0
H |1,-1> = (a-b) |1,-1>

which gives directly the energy :

a+b , 0 , a-b

is that right ? Actually I'm not sure about :

S²z |S,M> = M² |S,M>After, I need to calculate the average value of the magnetic moment so I need to be sure of the energy
 
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  • #2
Nico045 said:
S²z |S,M> = M² |S,M>
That is correct. Think of it as two successive applications of Sz. You are good so far.
 
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1. What is an eigenvalue of an Hamiltonian with spin?

An eigenvalue of an Hamiltonian with spin is a characteristic value that represents the total energy of a quantum system with a particular spin state. It is obtained by solving the eigenvalue equation, which is a mathematical equation that describes the behavior of the system.

2. How does spin affect the eigenvalues of an Hamiltonian?

Spin is an intrinsic property of fundamental particles, such as electrons, and it affects the energy levels of a system. The eigenvalues of an Hamiltonian with spin take into account the spin states of the particles in the system, leading to different energy levels for different spin states.

3. Can the eigenvalues of an Hamiltonian with spin be measured?

Yes, the eigenvalues of an Hamiltonian with spin can be measured experimentally. This is done by performing measurements on the quantum system and then using mathematical equations to calculate the eigenvalues based on the observed results.

4. How are the eigenvalues of an Hamiltonian with spin related to quantum mechanics?

The eigenvalues of an Hamiltonian with spin are a fundamental concept in quantum mechanics. They represent the possible energy levels of a system and are used to describe the behavior of particles at the quantum level.

5. What is the significance of eigenvalues of an Hamiltonian with spin?

The eigenvalues of an Hamiltonian with spin play a crucial role in understanding the behavior of quantum systems. They provide information about the energy levels and spin states of particles, which is essential for predicting and analyzing the behavior of these systems.

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