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Communication: Padé spectrum decomposition of Fermi function and Bose function

Hu, Jie, Xu, Rui-Xue, Yan, YiJing·2010·The Journal of Chemical Physics

Abstract

Padé approximant is exploited for an efficient sum-over-poles decomposition of Fermi and Bose functions. The resulting poles are all pure imaginary and can therefore be used to define Padé frequencies, in analogy with the celebrated Matsubara frequencies. The proposed Padé spectrum decomposition is shown to be equivalent to a truncated continued fraction. It converges significantly faster than other schemes such as the Matsubara expansion at all temperatures. By introducing the characteristic validity length as the measure of approximant, we analyze the convergence properties of different schemes thoroughly. Our results qualify the present scheme the best among all sum-over-poles approaches. Thus, it is of great value in efficient numerical evaluations of integrals involving Fermi/Bose function in various condensed-phase matter problems.

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Metadata

Authors
Hu, J., Xu, R.-X., & Yan, Y.
Venue
The Journal of Chemical Physics
Published
2010-09-14
Volume
133
Issue
10
Pages
101106-101106
ISSN
  • 0021-9606 (ISSN-L)
  • 1089-7690
OpenAlex
W1989988474
Cited by
260
References
10
FWCI
16.29
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Communication: Padé spectrum decomposition of Fermi function and Bose function. https://app.cochat.ai/papers/10.1063/1.3484491
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Hu, J., Xu, R.-X., & Yan, Y. (2010). Communication: Padé spectrum decomposition of Fermi function and Bose function. The Journal of Chemical Physics. https://doi.org/10.1063/1.3484491

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