A sparse sampling scheme derived from compact orthogonal bases dramatically reduces the number of imaginary-time and Matsubara-frequency points needed for accurate finite-temperature Green's function calculations.
We use the notation Tl(τ) to represent the order l Chebyshev polynomial mapped onto the interval [0,β ]
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Sparse sampling approach to efficient ab initio calculations at finite temperature
A sparse sampling scheme derived from compact orthogonal bases dramatically reduces the number of imaginary-time and Matsubara-frequency points needed for accurate finite-temperature Green's function calculations.