Charge order and antiferromagnetism in the extended Hubbard model
| Autor: | Hanna Terletska, Joseph Paki, Emanuel Gull, Sergei Iskakov |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Phase transition Phase boundary Condensed matter physics Hubbard model Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Square lattice Paramagnetism Hysteresis Condensed Matter - Strongly Correlated Electrons Phase (matter) 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology |
| Popis: | We study the extended Hubbard model on a two-dimensional half-filled square lattice using the dynamical cluster approximation. We present results on the phase boundaries between the paramagnetic metallic (normal) state and the insulating antiferromagnetic state, as well as between the antiferromagnetic and charge order states. We find hysteresis along the antiferromagnet/charge order and normal/charge order phase boundaries (at larger values of the on-site interaction), indicating first order phase transitions. We show that nearest neighbor interactions lower the critical temperature for the antiferromagnetic phase. We also present results for the effect of nearest neighbor interactions on the antiferromagnetic phase boundary and for the evolution of spectral functions and energetics across the phase transitions. 10 pages, 7 figures |
| Databáze: | OpenAIRE |
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