Chen Feng, Cohen Guy, Galperin Michael
Department of Physics, University of California San Diego, La Jolla, California 92093, USA.
The Raymond and Beverley Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 69978, Israel.
Phys Rev Lett. 2019 May 10;122(18):186803. doi: 10.1103/PhysRevLett.122.186803.
We introduce an auxiliary quantum master equation dual fermion method and argue that it presents a convenient way to describe steady states of correlated impurity models. The scheme yields an expansion around a reference that is much closer to the true nonequilibrium state than that in the original dual fermion formulation. In steady-state situations, the scheme is numerically inexpensive and avoids time propagation. The Anderson impurity model is used to test the approach against numerically exact benchmarks.
我们引入了一种辅助量子主方程对偶费米子方法，并认为它提供了一种描述关联杂质模型稳态的便捷方式。该方案围绕一个参考态展开，此参考态比原始对偶费米子公式中的参考态更接近真实的非平衡态。在稳态情况下，该方案在数值计算上成本较低且无需进行时间演化。我们使用安德森杂质模型对照数值精确的基准来测试此方法。
