Hierarchy of Self-Consistent Approximate Methods and the Parquet ...
Hierarchy of Self-Consistent Approximate Methods and the Parquet ...
Hierarchy of Self-Consistent Approximate Methods and the Parquet ...
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application II: Hubbard model (N c = 1)<br />
Hubbard model: H = −t ∑ 〈i,j〉,σ (c† i,σ c j,σ + h.c.) + U ∑ i n i,↑n i,↓<br />
-0.46<br />
-0.47<br />
Exact<br />
SC 2nd-order<br />
FLEX<br />
PA<br />
G(τ)<br />
-0.48<br />
-0.49<br />
U/T=1.5, Nc=1, Nl=64<br />
-0.5<br />
0 0.2 0.4 0.6 0.8 1<br />
τ/β<br />
<strong>Hierarchy</strong> <strong>of</strong> <strong>Self</strong>-<strong>Consistent</strong> <strong>Approximate</strong> <strong>Methods</strong> <strong>and</strong> <strong>the</strong> <strong>Parquet</strong> Formalism 37
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