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main.tex
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main.tex
@@ -242,6 +242,61 @@ We can look at the Nam conductivity now:
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As there is as yet no filtering based on the free energy, this is messy, so the comparison to \cref{fig:osRepro1b} is necessary to see which combinations of $T$ and $n$ are valid.
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However, this is still quite numerically unstable, even with the dimensional reduction procedure described above for $n$ and $\corr$.
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The information that higher $n$ leads to lower $\sigma$ is expected, and does suggest that the implementation is correct, although still very noisy.
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\section{Noise calculation}
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For our noise calculation, we assume a material parameterised by a Debye frequency $\debye$ and the interaction parameter $N(0) V$.
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Because these aren't necessarily experimentally accessible, I tried to keep their values such that they lead to a physically reasonable $T_c$.
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In order to keep $N(0) V$ small and $\debye$ bigger than the other parameters, I chose $N(0)V = 0.25$ and $\debye = \SI{1e13}{\per\s}$.
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This leads to $T_{c0} = T_c(\mu = 0) = \SI{1.44e11}{\per\s}$, similar to the values used for the equilibrium Nam case.
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\begin{enumerate}
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\item Use the Owen Scalapino coupled integral equations \cref{eq:gap,eq:n}, find $\mu$ and $\Delta$ for fixed $n$.
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\item Find the expected gap from the approximation in OS, $T_c(n) \approx (1 - 4n) T_{c0}$.
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If $T > T_c(n)$, then the calculation is skipped (a more complete handling would use either the Lindhard form or use a Nam expression that's been extended to $\Delta = 0$).
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This is necessary because the coupled integral equations are very hard to solve
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\item Using the modified Nam equations, calculate the dielectric function and create the approximated interpolation form, similar to the equilibrium case.
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\item Calculate the noise as usual.
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\end{enumerate}
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Some examples of the noise are potrayed below, from \crefrange{fig:smallomeganoise}{fig:largerTnoise}.
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constOmega/1}
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\caption{$T_1$ vs temperature, for very small omega} \label{fig:smallomeganoise}
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\end{figure}
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constOmega/10}
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\caption{$T_1$ vs temperature, for medium omega} \label{fig:mediumomeganoise}
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\end{figure}
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constOmega/13}
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\caption{$T_1$ vs temperature, for big omega} \label{fig:bigomeganoise}
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\end{figure}
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constT/64}
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\caption{$T_1$ vs frequency, for very small temperature} \label{fig:smallTnoise}
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\end{figure}
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constT/58}
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\caption{$T_1$ vs frequency, for medium temperature} \label{fig:mediumTnoise}
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\end{figure}
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\begin{figure}[htp]
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\centering
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\includegraphics[width=14cm]{constT/52}
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\caption{$T_1$ vs frequency, for larger temperature} \label{fig:largerTnoise}
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\end{figure}
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\printbibliography
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\end{document}
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