**Unformatted text preview: **(b) Write an ode for the phase diﬀerence θ between the two quantum mechanical wave functions describing the state of the two superconducting layers. (c) What are the conditions for, and the values of, any equilibrium points? (d) At an equilibrium point, what is the voltage V e across the device? What is the equivalent resistance R e of the device? Is it superconducting? (e) In this part, assume that the Josephson junction device parameters I c = 1 , R = ~ 2 e and C = β R for β = 1 . Using pplane7.m submit phase plane plots and plots of θ ( t ) for the two cases of I = 0 . 3 I c and I = 3 I c . (f) By considering the results of (c) and (e), under what conditions on the constant current source amplitude I can a Josephson junction device produce an oscillating voltage V across itself? (g) When the Josephson junction is not oscillating, what is its eventual equiva-lent resistance? 1...

View
Full Document

- Spring '06
- FINE
- Superconductivity, Volt, Condensed matter physics, Josephson junction, Josephson junction device