Negative electron compressibility in the Hubbard model
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- 20 December 2019
- journal article
- research article
- Published by IOP Publishing in Physica Scripta
- Vol. 95 (1) , 015806
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 μ . 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 μ ≈ 0 and μ ≈ 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.Keywords
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