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Consider the finite rectangular barrier described by the potential: where Vo is a real and positive...
1. Consider a finite square-well for which the size of the potential is Vo = 2m...
1. Consider a finite square-well for which the size of the potential is Vo = 2m (" where € < 1. Show that one and only one bound state exists. Find the approximate value of the energy of the bound state for € < 1.
2 The Square Barrier Let's work out the transmission coefficient T for a rectangular barrier defined...
2 The Square Barrier Let's work out the transmission coefficient T for a rectangular barrier defined by V(x) = { SV -a < x <a 10 21 >a for Vo > 0. There are three possible cases of interest: E<V, E = Vo, and E > Vo; the wavefunction inside the barrier is different in each case. (a) Find T-1 for E < Vo (b) Find T-1 for E= V (c) Find T-1 for E > V. (Hint: This one...
Consider a finite square barrier potential shown below. Figure A. For a<x<b, the space part of...
Consider a finite square barrier potential shown below. Figure A. For a<x<b, the space part of the electron wave function has the form: k? = 2mE/h? and gu2m(V,-E)/h2 (a) Aeikx (b) Aegn (c) Ae*** + Be** (d) Ae* (e) Aelkx + Be-ika For the finite square barrier potential shown below, Figure A. For x<a, the space part of the electron wave function has the form: k = 2mE/h? and g=2m(Vo-E) /h (a) Aeikx (b) Aetex (c) Ae*EN + Bet* (d)...
Figure 3. Double delta-function potential. X +a V(x) 2. Consider the symmetric, attractive double delta function potential illustrated in Fig. 3 where α is a positive constant. There are two lengths...
Figure 3. Double delta-function potential. X +a V(x) 2. Consider the symmetric, attractive double delta function potential illustrated in Fig. 3 where α is a positive constant. There are two lengths in this problem, the separation between the delta functions, 2a, and the decay lengthK-1-쁩)" of the wave function for an attractive delta function potential. [Note: In this problem, you may not need much math, but explain clearly the reasoning for your answers.] (a) How many bound states do you...
zone 1 Consider the following piecewise continuous, finite potential energy: ro; x < -a V(x)={-U, ;...
zone 1 Consider the following piecewise continuous, finite potential energy: ro; x < -a V(x)={-U, ; -a sxs a zone II U, > 0 (+ve) 10 ; x> a We consider zone III E>0: Unbound or scattering states (a) State the Time independent Schrödinger's Equation (TISE) and the expression of wave number k in each zone for the case of unbound state (b) Determine the expression of wave function u in each zone. (e) Determine the expression of probability Density...
2. An electron with energy E= 1 eV is incident upon a rectangular barrier of potential...
2. An electron with energy E= 1 eV is incident upon a rectangular barrier of potential energy Vo = 2 eV. About how wide must the barrier be so that the transmission probability is 10-37 Electron mass is m=9.1 x 10-31 kg. (Hint: note the word "about". A quick sensible approximation is accepted for full credit. The exact calculation is feasible in an exam, but long and perilous - avoid at all costs.]
Tunneling through arbitrary potential barrier Consider the tunneling problem in the WKB approximation through an arbitrary...
Tunneling through arbitrary potential barrier Consider the tunneling problem in the WKB approximation through an arbitrary shaped potential barrier V(2) where V (1) + 0 for x + to, the energy of the particle of mass m is E, and the classical turning points are a and b. Show that the transmission coefficient is given by where T=e=2(1 + (-21)-2 L = "p\dx .
5. Consider a square potential barrier in figure below: V(x) 0 x <0 a) Assume that...
5. Consider a square potential barrier in figure below: V(x) 0 x <0 a) Assume that incident particles of energy E> v are coming from-X. Find the stationary states (the equations for region . 2 and 3 and the main equation for the all regions). Apply the matching limit conditions in the figure. Explain and find all the constants used in the equations in terms of the parameters provided and Planck's constant -(6) Find the transmission and reflection coefficients. -(4)
3. This problem relates to the bound states of a finite-depth square well potential illustrated in...
3. This problem relates to the bound states of a finite-depth square well potential illustrated in Fig. 3. A set of solutions illustrated in Fig. 4, which plots the two sides of the trancendental equation, the solutions to which give the bound state wave functions and energies. In answering this problem, refer to the notation we used in class and that on the formula sheet. Two curves are plotted that represent different depths of the potential well, Voi and Vo2...
1. Consider a 1D finite square well potential defined as follows. Vo-a<x<a V(x) = 0otherwise a)...
1. Consider a 1D finite square well potential defined as follows. Vo-a<x<a V(x) = 0otherwise a) What are the energy eigenfunctions n of the Hamiltonian for a single particle bound in this potential? You may write your answer in piece-wise form, with an arbitrary normalization. b) Derive the characteristic equation that the energy eigenvalues E, must satisfy in order to satisfy the eigenvalue equation Hy,-EnUn for eigen function Un c) Write a computer program1 to find the eigenvalues E, for...
1. Consider a finite square-well for which the size of the potential is Vo = 2m (" where € < 1. Show that one and only one bound state exists. Find the approximate value of the energy of the bound state for € < 1.
2 The Square Barrier Let's work out the transmission coefficient T for a rectangular barrier defined by V(x) = { SV -a < x <a 10 21 >a for Vo > 0. There are three possible cases of interest: E<V, E = Vo, and E > Vo; the wavefunction inside the barrier is different in each case. (a) Find T-1 for E < Vo (b) Find T-1 for E= V (c) Find T-1 for E > V. (Hint: This one...
Consider a finite square barrier potential shown below. Figure A. For a<x<b, the space part of the electron wave function has the form: k? = 2mE/h? and gu2m(V,-E)/h2 (a) Aeikx (b) Aegn (c) Ae*** + Be** (d) Ae* (e) Aelkx + Be-ika For the finite square barrier potential shown below, Figure A. For x<a, the space part of the electron wave function has the form: k = 2mE/h? and g=2m(Vo-E) /h (a) Aeikx (b) Aetex (c) Ae*EN + Bet* (d)...
Figure 3. Double delta-function potential. X +a V(x) 2. Consider the symmetric, attractive double delta function potential illustrated in Fig. 3 where α is a positive constant. There are two lengths in this problem, the separation between the delta functions, 2a, and the decay lengthK-1-쁩)" of the wave function for an attractive delta function potential. [Note: In this problem, you may not need much math, but explain clearly the reasoning for your answers.] (a) How many bound states do you...
zone 1 Consider the following piecewise continuous, finite potential energy: ro; x < -a V(x)={-U, ; -a sxs a zone II U, > 0 (+ve) 10 ; x> a We consider zone III E>0: Unbound or scattering states (a) State the Time independent Schrödinger's Equation (TISE) and the expression of wave number k in each zone for the case of unbound state (b) Determine the expression of wave function u in each zone. (e) Determine the expression of probability Density...
2. An electron with energy E= 1 eV is incident upon a rectangular barrier of potential energy Vo = 2 eV. About how wide must the barrier be so that the transmission probability is 10-37 Electron mass is m=9.1 x 10-31 kg. (Hint: note the word "about". A quick sensible approximation is accepted for full credit. The exact calculation is feasible in an exam, but long and perilous - avoid at all costs.]
Tunneling through arbitrary potential barrier Consider the tunneling problem in the WKB approximation through an arbitrary shaped potential barrier V(2) where V (1) + 0 for x + to, the energy of the particle of mass m is E, and the classical turning points are a and b. Show that the transmission coefficient is given by where T=e=2(1 + (-21)-2 L = "p\dx .
5. Consider a square potential barrier in figure below: V(x) 0 x <0 a) Assume that incident particles of energy E> v are coming from-X. Find the stationary states (the equations for region . 2 and 3 and the main equation for the all regions). Apply the matching limit conditions in the figure. Explain and find all the constants used in the equations in terms of the parameters provided and Planck's constant -(6) Find the transmission and reflection coefficients. -(4)
3. This problem relates to the bound states of a finite-depth square well potential illustrated in Fig. 3. A set of solutions illustrated in Fig. 4, which plots the two sides of the trancendental equation, the solutions to which give the bound state wave functions and energies. In answering this problem, refer to the notation we used in class and that on the formula sheet. Two curves are plotted that represent different depths of the potential well, Voi and Vo2...
1. Consider a 1D finite square well potential defined as follows. Vo-a<x<a V(x) = 0otherwise a) What are the energy eigenfunctions n of the Hamiltonian for a single particle bound in this potential? You may write your answer in piece-wise form, with an arbitrary normalization. b) Derive the characteristic equation that the energy eigenvalues E, must satisfy in order to satisfy the eigenvalue equation Hy,-EnUn for eigen function Un c) Write a computer program1 to find the eigenvalues E, for...
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