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We find that imposing crossing symmetry in the iteration process considerably extends the range of convergence for solutions of the parquet equations for the Hubbard model. When crossing symmetry is not imposed, the convergence of both simple iteration and more complicated continuous loading (homotopy) methods is limited to high temperatures and weak… (More)

- S.-X Yang, H Fotso, H Hafermann, K.-M Tam, J Moreno, T Pruschke +1 other
- 2011

We have designed a multiscale approach for strongly correlated systems by combining the dynamical cluster approximation (DCA) and the recently introduced dual fermion formalism. This approach employs an exact mapping from a real lattice to a DCA cluster of linear size L c embedded in a dual fermion lattice. Short-length-scale physics is addressed by the DCA… (More)

- S-X Yang, H Fotso, S-Q Su, D Galanakis, E Khatami, J-H She +3 others
- Physical review letters
- 2011

We use the dynamical cluster approximation to understand the proximity of the superconducting dome to the quantum critical point in the two-dimensional Hubbard model. In a BCS formalism, T(c) may be enhanced through an increase in the d-wave pairing interaction (V(d)) or the bare pairing susceptibility (χ(0d)). At optimal doping, where V(d) is revealed to… (More)

The dynamical cluster approximation (DCA) is a method which systematically incorporates nonlocal corrections to the dynamical mean-field approximation. Here we present a pedagogical discussion of the DCA by describing it as a ˚-derivable coarse-graining approximation in k-space, which maps an infinite lattice problem onto a periodic finite-sized cluster… (More)

There is much interest in how quantum systems thermalize after a sudden change, because unitary evolution should preclude thermalization. The eigenstate thermalization hypothesis resolves this because all observables for quantum states in a small energy window have essentially the same value; it is violated for integrable systems due to the infinite number… (More)

• Leadership application usage tracking on #1 supercomputer in the nation, • Mega programming code development of DCA++ using C++, • Perform large-scale simulation on novel superconductor. • Develop and apply a parallel Monte Carlo code in Lattice Gauge Theory using C. Coexistence of strong nematic and superconducting correlations in a two-dimensional… (More)

- S Yang, E D 'azevedo, H Fotso, M Jarrell, J Liu, T Maier +2 others
- 2009

The parquet formalism to calculate the two-particle Green's functions of large systems requires the solution of a large, sparse, complex system of quadratic equations. If N f Matsubara frequencies are used for a system of size Nc, and Newton's method is used to solve the nonlinear system, the Jacobian system has O(8Nt 3) variables and O(40Nt 4) complex… (More)

We present a numerical solution of the parquet approximation, a conserving diagrammatic approach which is self-consistent at both the single-particle and the two-particle levels. The fully irreducible vertex is approximated by the bare interaction thus producing the simplest approximation that one can perform with the set of equations involved in the… (More)

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