Negative electron compressibility in the Hubbard Model
| Autor: | Alexei Sherman |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Range (particle radiation) Hubbard model Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) 010308 nuclear & particles physics Diagram FOS: Physical sciences Charge (physics) Electron Condensed Matter Physics 01 natural sciences Square lattice Atomic and Molecular Physics and Optics Condensed Matter - Strongly Correlated Electrons 0103 physical sciences Compressibility 010306 general physics Mathematical Physics Spin-½ |
| Popis: | 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 $��U$, where $U$ is the Hubbard repulsion. For even lower temperatures, in the neighborhood of these regions, states with the phase separation are revealed. 11 pages, 5 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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