Negative electron compressibility in the Hubbard model

Using the strong coupling diagram technique, we study the one-band repulsive Hubbard model on a two-dimensional square lattice in a wide range of chemical potentials . Infinite sequences of diagrams describing interactions of electrons with spin and charge fluctuations are taken into account. At low...

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Published inPhysica scripta Vol. 95; no. 1; pp. 15806 - 15811
Main Author Sherman, A
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.01.2020
Subjects
negative electron compressibility
one-band repulsive Hubbard model
strong coupling diagram technique
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Abstract Using the strong coupling diagram technique, we study the one-band repulsive Hubbard model on a two-dimensional square lattice in a wide range of chemical potentials . Infinite sequences of diagrams describing interactions of electrons with spin and charge fluctuations are taken into account. At low temperatures, regions of the negative electron compressibility are found for 0 and U, where U is the Hubbard repulsion. They are manifestations of non-rigid electron bands, which change drastically in the mentioned regions of chemical potentials due to the level crossing in the Hubbard atom.
AbstractList Using the strong coupling diagram technique, we study the one-band repulsive Hubbard model on a two-dimensional square lattice in a wide range of chemical potentials . Infinite sequences of diagrams describing interactions of electrons with spin and charge fluctuations are taken into account. At low temperatures, regions of the negative electron compressibility are found for 0 and U, where U is the Hubbard repulsion. They are manifestations of non-rigid electron bands, which change drastically in the mentioned regions of chemical potentials due to the level crossing in the Hubbard atom.
Author Sherman, A
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crossref_primary_10_3390_condmat5040065
crossref_primary_10_7566_JPSJ_90_104707
crossref_primary_10_1088_1402_4896_ac03e2
crossref_primary_10_1140_epjb_e2020_10221_4
crossref_primary_10_1142_S0217979222500813
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Snippet Using the strong coupling diagram technique, we study the one-band repulsive Hubbard model on a two-dimensional square lattice in a wide range of chemical...
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SubjectTerms negative electron compressibility
one-band repulsive Hubbard model
strong coupling diagram technique
Title Negative electron compressibility in the Hubbard model
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