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Nonlocal correlatio...
Nonlocal correlation effects in fermionic many-body systems : Overcoming the noncausality problem
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- Backes, Steffen (författare)
- College de France,École Polytechnique,European Theoretical Spectroscopy Facility (ETSF)
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- Sim, Jae Hoon (författare)
- École Polytechnique
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- Biermann, Silke (författare)
- Lund University,Lunds universitet,Matematisk fysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Mathematical Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,European Theoretical Spectroscopy Facility (ETSF),École Polytechnique,College de France
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(creator_code:org_t)
- 2022
- 2022
- Engelska.
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Ingår i: Physical Review B. - 2469-9950. ; 105:24
- Relaterad länk:
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http://dx.doi.org/10...
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visa fler...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Motivated by the intriguing physics of quasi-two-dimensional fermionic systems, such as high-temperature superconducting oxides, layered transition metal chalcogenides, or surface or interface systems, the development of many-body computational methods geared at including both local and nonlocal electronic correlations has become a rapidly evolving field. It has been realized, however, that the success of such methods can be hampered by the emergence of noncausal features in the effective or observable quantities involved. Here, we present an approach wherein local many-body techniques such as dynamical mean-field theory (DMFT) are extended to nonlocal correlations and interactions, which preserves causality and has a physically intuitive interpretation. Our strategy has implications for the general class of DMFT-inspired many-body methods and can be adapted to cluster, dual boson, or dual fermion techniques with minimal effort.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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