Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation
Abstract
In this study, we investigate the interaction energy and the possibility of itinerant ferromagnetism in a strongly interacting Fermi gas at zero temperature in the absence of molecule formation. The interaction energy is obtained by summing the perturbative contributions of Galitskii-Feynman type to all orders in the gas parameter. It can be expressed by a simple phase-space integral of an in-medium scattering phase shift. In both three and two dimensions (3D and 2D), the interaction energy shows a maximum before reaching the resonance from the Bose-Einstein condensate side, which provides a possible explanation of the experimental measurements of the interaction energy. This phenomenon can be theoretically explained by the qualitative change of the nature of the binary interaction in the medium. The appearance of an energy maximum has significant effects on the itinerant ferromagnetism. In 3D, the ferromagnetic transition is reentrant and itinerant ferromagnetism exists in a narrow window around the energy maximum. In 2D, the present theoretical approach suggests that itinerant ferromagnetism does not exist, which reflects the fact that the energy maximum becomes much lower than the energy of the fully polarized state.
- Authors:
-
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1238677
- Alternate Identifier(s):
- OSTI ID: 1179674
- Report Number(s):
- LA-UR-14-23537
Journal ID: ISSN 1050-2947; PLRAAN; TRN: US1600423
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review A - Atomic, Molecular, and Optical Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 5; Journal ID: ISSN 1050-2947
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; strongly interacting Fermi gas; itinerant ferromagnetism
Citation Formats
He, Lianyi. Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation. United States: N. p., 2014.
Web. doi:10.1103/PhysRevA.90.053633.
He, Lianyi. Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation. United States. https://doi.org/10.1103/PhysRevA.90.053633
He, Lianyi. Wed .
"Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation". United States. https://doi.org/10.1103/PhysRevA.90.053633. https://www.osti.gov/servlets/purl/1238677.
@article{osti_1238677,
title = {Interaction energy and itinerant ferromagnetism in a strongly interacting Fermi gas in the absence of molecule formation},
author = {He, Lianyi},
abstractNote = {In this study, we investigate the interaction energy and the possibility of itinerant ferromagnetism in a strongly interacting Fermi gas at zero temperature in the absence of molecule formation. The interaction energy is obtained by summing the perturbative contributions of Galitskii-Feynman type to all orders in the gas parameter. It can be expressed by a simple phase-space integral of an in-medium scattering phase shift. In both three and two dimensions (3D and 2D), the interaction energy shows a maximum before reaching the resonance from the Bose-Einstein condensate side, which provides a possible explanation of the experimental measurements of the interaction energy. This phenomenon can be theoretically explained by the qualitative change of the nature of the binary interaction in the medium. The appearance of an energy maximum has significant effects on the itinerant ferromagnetism. In 3D, the ferromagnetic transition is reentrant and itinerant ferromagnetism exists in a narrow window around the energy maximum. In 2D, the present theoretical approach suggests that itinerant ferromagnetism does not exist, which reflects the fact that the energy maximum becomes much lower than the energy of the fully polarized state.},
doi = {10.1103/PhysRevA.90.053633},
journal = {Physical Review A - Atomic, Molecular, and Optical Physics},
number = 5,
volume = 90,
place = {United States},
year = {Wed Nov 26 00:00:00 EST 2014},
month = {Wed Nov 26 00:00:00 EST 2014}
}
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