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Consider a superlattice consisting of alternating layers of equal thickness of GaAs and AlAs. The potential is a square wave with the minima in GaAs for the F-valley, but for the X-valleys the minima are in AlAs (Figure 3.8). The lowest parts of the conduction band are the F minima in GaAs, so it seems obvious that this is where electrons would migrate. However, this does not take account of the zero-point energy in the quantum wells, which is strongly affected by the difference in mass. The lowest state in the X-valleys arises from the high longitudinal mass, mL ≈1.1 in AlAs (Section 5.8.1). Show that the lowest state for electrons moves from GaAs to AlAs as the period of the superlattice is reduced, and find the critical value. Use an infinitely deep well for a rough estimate, or a finite well for a more accurate result.
Are the holes affected in the same way? Is it possible to make a type II superlattice, where the electrons are confined in one material with the holes in the other?
Young's double-slit experiment is performed with 587-nm light and a distance of 2.00 m between the slits, Determine the spacing of the slits
Find the drift velocity of conduction electrons in a gold wire of diameter 2.36 mm when a current of 0.375 A flows in it. The density of conduction electrons in gold is 5.90x10^28m^-3
How many nitrogen molecules must strike a 1 cm2 surface each second to exert a pressure of 1 atm (Assume that the molecules are all moving at the same speed, at a temperature of 300K, and 45 degree angle to the wall).
Two automobiles of equal mass approach an intersection. One vehicle is traveling with velocity 12.1 m/s toward the east, What was the initial speed of the northward-moving vehicle
What is the value of acceleration of gravity if a pendulum has a length of 46 cm and the pendulum completes 110 full swing cycles in a time of 132 seconds.
An escalator is needed to carry 80 passengers per minute a vertical distance of 7.0 meter. Mass of each passenger is 65 kilogram. Determine the total amount of work
If the vertical posts supporting these wires divide the lines into straight 20 meter segments, find what magnetic force does each segment exert on other
A freely falling object requires 1.20s to travel the last 33.0 m before ithits the ground. From what height above the ground did it fall
How many decibels does a dog produce generally, and what is the peak volume that a dog produces? So this will vary with breed, but I am mostly interested in medium to large sized dogs. If you provide a reliable citation, a good source that I can u..
Water flows through a Venturi meter with a pipe diameter of 10.0 cm and a constriction diameter of 5.6 cm. Find the flow rate of the water in the pipe of 10.0 cm diameter
A balloon contains 0.63 mol of helium. It rises, in maintaining a constant 280 K temperature, to an altitude where its volume has expanded three times. How much work is done by the gas during this isothermal expansion?
question1vector a points alone the y access and has a magnitude of 100 units vector b points at an angle of 60 degrees
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