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Dual Bethe-Salpeter...
Dual Bethe-Salpeter equation for the multiorbital lattice susceptibility within dynamical mean-field theory
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- Van Loon, Erik G.C.P. (författare)
- Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,LTH profilområde: Nanovetenskap och halvledarteknologi,LTH profilområden,Other operations, LTH,Faculty of Engineering, LTH,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,LTH Profile Area: Nanoscience and Semiconductor Technology,LTH Profile areas,Faculty of Engineering, LTH,NanoLund and Division of Mathematical Physics, Department of Physics, Lund University, Lund, Sweden
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- Strand, Hugo U. R., 1983- (författare)
- Örebro University,Örebro universitet,Institutionen för naturvetenskap och teknik,Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands
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(creator_code:org_t)
- American Physical Society, 2024
- 2024
- Engelska.
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Ingår i: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 109:15
- Relaterad länk:
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https://doi.org/10.1...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Dynamical mean -field theory describes the impact of strong local correlation effects in many -electron systems. While the single -particle spectral function is directly obtained within the formalism, two -particle susceptibilities can also be obtained by solving the Bethe-Salpeter equation. The solution requires handling infinite matrices in Matsubara frequency space. This is commonly treated using a finite frequency cutoff, resulting in slow linear convergence. A decomposition of the two -particle response in local and nonlocal contributions enables a reformulation of the Bethe-Salpeter equation inspired by the dual boson formalism. The reformulation has a drastically improved cubic convergence with respect to the frequency cutoff, considerably facilitating the calculation of susceptibilities in multi -orbital systems. This improved convergence arises from the fact that local contributions can be measured in the impurity solver. The dual Bethe-Salpeter equation uses the fully reducible vertex which is free from vertex divergences. We benchmark the approach on several systems including the spin susceptibility of strontium ruthenate Sr 2 RuO 4 , a strongly correlated Hund's metal with three active orbitals.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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