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Problem 2. (30 points) The spin states: s 1,m) and Is -2, m1) composed of spin-3/2 and spin-1/2 states are linear combi...
1. (30 points). Coupled spins. Spin-1/2 particles A and B evolve under the influence of the follo...
1. (30 points). Coupled spins. Spin-1/2 particles A and B evolve under the influence of the following Hamiltonian (for simplicity takeh-1 so that energies are expressed in frequency units): We work in the uncoupled basis aba) Ib), where a,b E 0,1 and where states 0) (1)) correspond to single spins aligned (antialigned) with the z-direction. As we discussed in lecture, the eigenstates of the Hamiltonian are 100), 111), and 2-1/2 (101) 110)). a. We prepare the initial state t01). Since...
2. Spin-1/2 system: (20 points) The Pauli matrices are, 0 -1 from which we can define...
2. Spin-1/2 system: (20 points) The Pauli matrices are, 0 -1 from which we can define the spin matrices, s.-슬&z, Šv = , S.-출.. We'll use the eigenkets of S that, for the spin half system, they can be represented by the spinors, a) Show, by matrix multiplication that |+) and |-) are eigenstates of the S operator and determine the eigenvalues. Show that they are not eigenstates of S and Sy b) Show that the matrix squares s ,...
qm 2019.3 3. The Hamiltonian corresponding to the magnetic interaction of a spin 1/2 particle with...
qm 2019.3
3. The Hamiltonian corresponding to the magnetic interaction of a spin 1/2 particle with charge e and mass m in a magnetic field B is À eB B. Ŝ, m where Ŝ are the spin angular momentum operators. You should make use of expres- sions for the spin operators that are given at the end of the question. (i) Write down the energy eigenvalue equation for this particle in a field directed along the y axis, i.e. B...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a system of two spin-^ particles b) Use the table (given below) to verify the Clebsch-Gordan coefficients c) Construct the , 12;l, m)- 1,1;0,0) state explicitly and by using the table Table 1: Clebsch-Gordan coefficients (ji, 1, m2ljm) m2 =- Clebsch-Gordan coefficients 〈J1, 1; m1, m2|JM》 Table 2: 1 +1 71 2j1i+ 1-m)(i-m+1 2j1 (2j1+1 2j1 (2j1+ 11 (21+
2. The 2p, and 2py wave functions are constructed as linear combinations of the n-2, l-1, m+ 1 wa...
2. The 2p, and 2py wave functions are constructed as linear combinations of the n-2, l-1, m+ 1 wave functions which are eigenfunctions of the hydrogen atom Hamiltonian. Are 2px and 2py wave functions also eigenfunctions of the hydrogen atom Hamiltonian? In other words, do 2px and 2py wave functions denote the same energy states as n=2, 1-1, m=-1 wave functions of the hydrogen atom? (20 points).
2. The 2p, and 2py wave functions are constructed as linear combinations of...
1. We begin with a two state system with states labeled by |1) and [2). This...
1. We begin with a two state system with states labeled by |1) and [2). This may seem unphysical; however, there are many two state systems in quantum mechanics such spin 1/2 particles. The Hamiltonian we consider is (a) Compute the eigenvalues of H (b) Compute the eigenvectors of H, normalize them, and express them both as column vectors and in terms of | 1〉 and |2) (c) Denoting the two eigenvectors as lva) and |Vb), compute l/a) <>a and...
1. In this problem, we are going to look at a three-level system. A spin-1 particld is placed in ...
1. In this problem, we are going to look at a three-level system. A spin-1 particld is placed in a constant magnetic field along the a-direction with strength B,. The spin-1 particle İs initialized in a z-eigenstate with positive eigenvalue h, ie, the i 1,m 1) state. What is the probability to find the negative eigenvalue the spin along the z axis as a function of time? Assume that the spin-1 particle has inagnetic moment 2 × μιι, i.e. that...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a system of two spin-z pa...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a system of two spin-z particles b) Use the table (given below) to verify the Clebsch-Gordan coefficients c) Construct the 1, 12;1, m) 1, 1;0, 0) state explicitly and by using the table Table 1: Clebsch-Gordan coefficients (1,mi, m2ljm) m2 =- ji 2 131-m+ Table 2: Clebsch-Gordan coefficients (j1,1;m, m2jm) m20 1-m+1)01+m+1 2j1101+ j11 (21 +1) (21+2) 71 231 (ว่า+ (31+ (1-m)1-m+1)12
Exercise 1: addition...
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 ot...
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...
2. Interacting Spins (5 points each part, 30 points total). Two spins, each of which can...
2. Interacting Spins (5 points each part, 30 points total). Two spins, each of which can be in one of two states, up or down, are in equilibrium with a heat reservoir at temperature t. They interact as follows: When the two spins point in the same direction, their interaction energy is – J, and when they point in opposite directions, their interaction energy is J. The spins also each have a magnetic moment m and are subject to a...
1. (30 points). Coupled spins. Spin-1/2 particles A and B evolve under the influence of the following Hamiltonian (for simplicity takeh-1 so that energies are expressed in frequency units): We work in the uncoupled basis aba) Ib), where a,b E 0,1 and where states 0) (1)) correspond to single spins aligned (antialigned) with the z-direction. As we discussed in lecture, the eigenstates of the Hamiltonian are 100), 111), and 2-1/2 (101) 110)). a. We prepare the initial state t01). Since...
2. Spin-1/2 system: (20 points) The Pauli matrices are, 0 -1 from which we can define the spin matrices, s.-슬&z, Šv = , S.-출.. We'll use the eigenkets of S that, for the spin half system, they can be represented by the spinors, a) Show, by matrix multiplication that |+) and |-) are eigenstates of the S operator and determine the eigenvalues. Show that they are not eigenstates of S and Sy b) Show that the matrix squares s ,...
qm 2019.3
3. The Hamiltonian corresponding to the magnetic interaction of a spin 1/2 particle with charge e and mass m in a magnetic field B is À eB B. Ŝ, m where Ŝ are the spin angular momentum operators. You should make use of expres- sions for the spin operators that are given at the end of the question. (i) Write down the energy eigenvalue equation for this particle in a field directed along the y axis, i.e. B...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a system of two spin-^ particles b) Use the table (given below) to verify the Clebsch-Gordan coefficients c) Construct the , 12;l, m)- 1,1;0,0) state explicitly and by using the table Table 1: Clebsch-Gordan coefficients (ji, 1, m2ljm) m2 =- Clebsch-Gordan coefficients 〈J1, 1; m1, m2|JM》 Table 2: 1 +1 71 2j1i+ 1-m)(i-m+1 2j1 (2j1+1 2j1 (2j1+ 11 (21+
2. The 2p, and 2py wave functions are constructed as linear combinations of the n-2, l-1, m+ 1 wave functions which are eigenfunctions of the hydrogen atom Hamiltonian. Are 2px and 2py wave functions also eigenfunctions of the hydrogen atom Hamiltonian? In other words, do 2px and 2py wave functions denote the same energy states as n=2, 1-1, m=-1 wave functions of the hydrogen atom? (20 points).
2. The 2p, and 2py wave functions are constructed as linear combinations of...
1. We begin with a two state system with states labeled by |1) and [2). This may seem unphysical; however, there are many two state systems in quantum mechanics such spin 1/2 particles. The Hamiltonian we consider is (a) Compute the eigenvalues of H (b) Compute the eigenvectors of H, normalize them, and express them both as column vectors and in terms of | 1〉 and |2) (c) Denoting the two eigenvectors as lva) and |Vb), compute l/a) <>a and...
1. In this problem, we are going to look at a three-level system. A spin-1 particld is placed in a constant magnetic field along the a-direction with strength B,. The spin-1 particle İs initialized in a z-eigenstate with positive eigenvalue h, ie, the i 1,m 1) state. What is the probability to find the negative eigenvalue the spin along the z axis as a function of time? Assume that the spin-1 particle has inagnetic moment 2 × μιι, i.e. that...
Exercise 1: addition of angular momentum a) Explicitly construct the states of total spin for a system of two spin-z particles b) Use the table (given below) to verify the Clebsch-Gordan coefficients c) Construct the 1, 12;1, m) 1, 1;0, 0) state explicitly and by using the table Table 1: Clebsch-Gordan coefficients (1,mi, m2ljm) m2 =- ji 2 131-m+ Table 2: Clebsch-Gordan coefficients (j1,1;m, m2jm) m20 1-m+1)01+m+1 2j1101+ j11 (21 +1) (21+2) 71 231 (ว่า+ (31+ (1-m)1-m+1)12
Exercise 1: addition...
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...
2. Interacting Spins (5 points each part, 30 points total). Two spins, each of which can be in one of two states, up or down, are in equilibrium with a heat reservoir at temperature t. They interact as follows: When the two spins point in the same direction, their interaction energy is – J, and when they point in opposite directions, their interaction energy is J. The spins also each have a magnetic moment m and are subject to a...
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