Field-induced ferromagnetic phase transition in two-dimensional Fermi systems with magnetic dipole-dipole interaction
| Autor: | G. H. Bordbar, A. Poostforush, F. Pouresmaeeli |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Phase transition Zeeman effect Condensed matter physics Spin polarization 01 natural sciences Second quantization 010305 fluids & plasmas Magnetic field symbols.namesake Ferromagnetism 0103 physical sciences symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics Fermi gas Magnetic dipole–dipole interaction |
| Zdroj: | Physical Review A. 98 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | Magnetic properties of the two-dimensional spin-polarized Fermi gas with dipole-dipole interaction are studied in the presence of external magnetic field at zero temperature. Within perturbation theory and the second quantization formalism, the total energy is explicitly obtained as a function of three dimensionless parameters, the spin polarization, dipolar coupling and Zeeman parameters. We examine the effects of these agents on the magnetic properties of 2D Fermi gas. The results show that an induced ferromagnetic phase transition is observed only for adequately large values of magnetic field. This paper offers two controllable factors to change the spin polarization of the system. |
| Databáze: | OpenAIRE |
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