
Interpretation:
To sketch the super-current Ic sin ϕ (t) as a function of t assuming that IIc is slightly greater than 1 and IIc >> 1, for a Josephson junction in the over-damped limit β = 0. To sketch the instantaneous voltage V(t) for both the cases
Concept Introduction:
The Josephson relation in the over-damped limit β = 0 is given by ˙ϕ = IIc - sin ϕ.
Josephson voltage-phase relation is given by V = ℏ2e˙ϕ

Answer to Problem 1E
Solution:
a) The super-current Ic sin ϕ (t) as a function of t assuming that IIc is slightly greater than 1 and IIc >> 1 for a Josephson junction in the over-damped limit β = 0 is sketched.
b) The instantaneous voltage V(t) for both the cases is sketched.
Explanation of Solution
Josephson junctions are superconducting devices that are capable of generating voltage oscillations of extraordinarily high frequency. It consists of two closely spaced superconductors separated by a weak connection.
The Josephson relation in the over-damped limit β = 0 is given by
˙ϕ = IIc - sin ϕ
Here, Ic is the critical current.
Assuming that IIc is slightly greater than 1
Consider IIc = 1.1
˙ϕ = 1.1 - sin ϕ
The graph of ϕ vs. t is shown below
Assuming that IIc >> 1.
Consider IIc = 10,
ϕ′ = 10 - sin ϕ
The graph of ϕ vs. t is shown below.
b) Josephson voltage-phase relation is given by
V = ℏ2e˙ϕ
Substituting ˙ϕ = IIc - sin ϕ, we get
V = ℏ2e(IIc - sin ϕ)
Consider IIc = 1.1
The graph of voltage vs. ϕ is shown below.
V = ℏ2e(IIc - sin ϕ)
Consider IIc = 10
The graph of voltage vs. ϕ is shown below.
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