An electron of magnetic moment υ = γ S is placed in a magnetic field B = (-ωx/γ, -ωy/γ, -ωz/γ). Show that the evolution operator of the spin is U(t,0) = exp(-iυt)
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An electron of magnetic moment mu = gamma S is placed in a magnetic field B = (-omega x/ gamma, - omega y/gamma,- omega z/gamma). Show that the evolution operator of the spin is U(t,0) = exp(-imut).
6. Given the spin Hamiltonian of an electron in a magnetic field B-Bok, H--y5.B, find the time evolution Unitary operator given as U(6) - exp(-()/N). Given that the initial quantum state is le (O) >= 0) find the state after a time t given as (10 points) () >= U(t)|(0) >
Intro to Quantum Mechanics Problem: An electron under the influence of a uniform magnetic field By in the y-direction has its spin initially (at 0) pointing in the positive x-direction. That is, it is in an eigenstate of S with eigenvalue +,S h. The Hamiltonian H--μ . B-γ By Sy consists of the interaction of the magnetic dipole moment μ due to spin and the magnetic field B. Show that the probability of finding the electron with its spin pointing...
) cos(0/2) + -2) state is placed in a magnetic field with strength B pointing 4. Larmor precession: an electron prepared in the V(t 0 sin(0/2)e in the a-direction. Calculate the time evolution of the electron's spin state. In addition calculate the time evolution of (S), S and (S ). (2 points)
(a) If an atom with one unpaired electron spin is placed in a magnetic field B, then there are two energy levels, corresponding to the two values of the quantum number ms. Calculate the energy difference AU between the states. (b) If the atom is irradiated it will absorb energy if the frequency v=4. This is phenomenon is called electron spin resonance. Calculate the frequency if B, is 27. In what part of the electromagnetic spectrum is this frequency?
Question 1 A system of N identical non-interacting magnetic ions of spin Y%, has energy u tHo for each spin. μο is the magnetic moment in a crystal at absolute temperature T in a magnetic field B. For this system calculate: a) The partition function, Z. b) Free energy, F. c) The entropy. S d) The average energy, U e) The average magnetic moment, M
1. (50 pts) Consider the spin degree of freedom of an electron under an external magnetic field in the r-direction. The spin is initially (at time t 0) in the z-direction. (a) Write down the Hamiltonian for the electron spin. (Do you remember the elementary magnetic moment of electron, the Bohr magneton μΒ, in terms of electron mass me and the elementary charge e?) b) Write down the Schrödinger equation for the spin (c) Describe the motion of spin direction
A spin-1 particle interacts with an external magnetic field B = B. The interaction Hamiltonian for the system is H = gB-S, where S-Si + Sỳ + SE is the spin operator. (Ignore all degrees of freedom other than spin.) (a) Find the spin matrices in the basis of the S. S eigenstates, |s, m)) . (Hint: Use the ladder operators, S -S, iS, and S_-S-iS,, and show first that s_ | 1,0-ћ /2 | 1.-1)) . Then use these...
9. An electron moving with non-relativistic velocity v in an electric field E experiences a magnetic fieldB given by: v x (-V(r)) v x E B=- where (r) is the electric potential. This magnetic field interacts with the magnetic moment u of the electron given by -S, =n me where S is the electron spin. Assuming non-relativistic mechanics, show that the Hamiltonian representing this effect (spin-orbit coupling) for a spherically-symmetric electric potential is: 1 dφ(r) S.L ΔΗ [6] r dr...
If an H atom with a 1s configuration is placed in a magnetic field, the electron spin degeneracy will be removed and the number of states with different energies will be A. One B. Two C. Three D. None of the above
4. When an external magnetic field B is applied, a "spin-1" ion has 3 magnetic states with energies given Em=aBm, m=-1,0,1, where a is a constant of order a few times the Bohr magneton up = en/(2m). (Note: the notation here is quite different from that of Kittel & Kroemer who use "m" for the elementary magnetic moment which we have denoted a. In our terminology, m=ms is an integer quantum number: m=-1 labels the "spin down" state, m=0 labels...