How to plot this equation

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ijsonvjksrefdsb 2024-1-11

回答： Paul 2024-1-11

I'm trying to plot the figure below, but I don't really understand what function to use to achieve this.

β is defined as

, where the T used is for low temperature

I tried using syms delta and fplot(@(delta) U) but that doesn't seem right.

Matt J 2024-1-11

but that doesn't seem right.

Why not?

Paul 2024-1-11

syms U Delta beta T k_beta

U = -Delta/2*tanh(beta*Delta/2)

U =

UoverDelta = U/Delta

UoverDelta =

UoverDelta = subs(UoverDelta,beta,inv(k_beta*T))

UoverDelta =

syms w

UoverDelta = subs(UoverDelta,k_beta*T/Delta,w)

UoverDelta =

figure

fplot(UoverDelta,[0 10])

ylim([-1 0])

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