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Article: Identification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data

TitleIdentification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data
Authors
Issue Date2020
PublisherNature Publishing Group: Open Access Journals. The Journal's web site is located at http://www.nature.com/npjquantmats/
Citation
npj Quantum Materials, 2020, v. 5, article no. 65 How to Cite?
AbstractQuantum Monte Carlo (QMC) simulations of correlated electron systems provide unbiased information about system behavior at a quantum critical point (QCP) and can verify or disprove the existing theories of non-Fermi liquid (NFL) behavior at a QCP. However, simulations are carried out at a finite temperature, where quantum critical features are masked by finite-temperature effects. Here, we present a theoretical framework within which it is possible to separate thermal and quantum effects and extract the information about NFL physics at T = 0. We demonstrate our method for a specific example of 2D fermions near an Ising ferromagnetic QCP. We show that one can extract from QMC data the zero-temperature form of fermionic self-energy Σ(ω) even though the leading contribution to the self-energy comes from thermal effects. We find that the frequency dependence of Σ(ω) agrees well with the analytic form obtained within the Eliashberg theory of dynamical quantum criticality, and obeys ω2/3 scaling at low frequencies. Our results open up an avenue for QMC studies of quantum critical metals.
Persistent Identifierhttp://hdl.handle.net/10722/285494
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 2.247
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXu, XY-
dc.contributor.authorKlein, A-
dc.contributor.authorSun, K-
dc.contributor.authorChubukov, AV-
dc.contributor.authorMeng, ZY-
dc.date.accessioned2020-08-18T03:53:57Z-
dc.date.available2020-08-18T03:53:57Z-
dc.date.issued2020-
dc.identifier.citationnpj Quantum Materials, 2020, v. 5, article no. 65-
dc.identifier.issn2397-4648-
dc.identifier.urihttp://hdl.handle.net/10722/285494-
dc.description.abstractQuantum Monte Carlo (QMC) simulations of correlated electron systems provide unbiased information about system behavior at a quantum critical point (QCP) and can verify or disprove the existing theories of non-Fermi liquid (NFL) behavior at a QCP. However, simulations are carried out at a finite temperature, where quantum critical features are masked by finite-temperature effects. Here, we present a theoretical framework within which it is possible to separate thermal and quantum effects and extract the information about NFL physics at T = 0. We demonstrate our method for a specific example of 2D fermions near an Ising ferromagnetic QCP. We show that one can extract from QMC data the zero-temperature form of fermionic self-energy Σ(ω) even though the leading contribution to the self-energy comes from thermal effects. We find that the frequency dependence of Σ(ω) agrees well with the analytic form obtained within the Eliashberg theory of dynamical quantum criticality, and obeys ω2/3 scaling at low frequencies. Our results open up an avenue for QMC studies of quantum critical metals.-
dc.languageeng-
dc.publisherNature Publishing Group: Open Access Journals. The Journal's web site is located at http://www.nature.com/npjquantmats/-
dc.relation.ispartofnpj Quantum Materials-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleIdentification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data-
dc.typeArticle-
dc.identifier.emailMeng, ZY: zymeng@hku.hk-
dc.identifier.authorityMeng, ZY=rp02524-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/s41535-020-00266-6-
dc.identifier.scopuseid_2-s2.0-85090787455-
dc.identifier.hkuros312876-
dc.identifier.volume5-
dc.identifier.spagearticle no. 65-
dc.identifier.epagearticle no. 65-
dc.identifier.isiWOS:000568299000001-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl2397-4648-

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