Mateus Marques, Bruno M. de Souza Melo, Alexandre R. Rocha, Caio Lewenkopf, Luis G. G. V. Dias da Silva
{"title":"Suppression of the Mott insulating phase in the particle-hole asymmetric Hubbard model","authors":"Mateus Marques, Bruno M. de Souza Melo, Alexandre R. Rocha, Caio Lewenkopf, Luis G. G. V. Dias da Silva","doi":"arxiv-2409.06674","DOIUrl":null,"url":null,"abstract":"We explore the phase diagram of the Mott metal-insulator transition (MIT),\nfocusing on the effects of particle-hole asymmetry (PHA) in the single-band\nHubbard model. Our dynamical mean-field theory (DMFT) study reveals that the\nintroduction of PHA in the model significantly influences the critical\ntemperature ($T_c$) and interaction strength ($U_c$), as well as the size of\nthe co-existence region of metallic and insulating phases at low temperatures.\nSpecifically, as the system is moved away from particle-hole symmetry, $T_c$\ndecreases and $U_c$ increases, indicating a suppression of the insulating phase\nand the strengthening of the metallic behavior. Additionally, the first-order\ntransition line between metallic and insulating phases is better defined in the\nmodel with PHA, leading to a reduced co-existence region at $T<T_c$. Moreover,\nwe propose that the MIT can be characterized by the charge density, which\nserves as a viable alternative to zero-frequency spectral density typically\nused in DMFT calculations. Our findings provide new insights into the role of\nparticle-hole asymmetry in the qualitative and quantitative characterization of\nthe MIT even in a very simple system.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"29 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv - PHYS - Strongly Correlated Electrons","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/arxiv-2409.06674","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We explore the phase diagram of the Mott metal-insulator transition (MIT),
focusing on the effects of particle-hole asymmetry (PHA) in the single-band
Hubbard model. Our dynamical mean-field theory (DMFT) study reveals that the
introduction of PHA in the model significantly influences the critical
temperature ($T_c$) and interaction strength ($U_c$), as well as the size of
the co-existence region of metallic and insulating phases at low temperatures.
Specifically, as the system is moved away from particle-hole symmetry, $T_c$
decreases and $U_c$ increases, indicating a suppression of the insulating phase
and the strengthening of the metallic behavior. Additionally, the first-order
transition line between metallic and insulating phases is better defined in the
model with PHA, leading to a reduced co-existence region at $T
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