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Title: Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study

Abstract

We investigate the phase diagram of a two-component repulsive Fermi gas at T=0 by means of quantum Monte Carlo simulations. Both purely repulsive and resonant attractive model potentials are considered in order to analyze the limits of the universal regime where the details of interatomic forces can be neglected. The equation of state of both balanced and unbalanced systems is calculated as a function of the interaction strength and the critical density for the onset of ferromagnetism is determined. The energy of the strongly polarized gas is calculated and parametrized in terms of the physical properties of repulsive polarons, which are relevant for the stability of the fully ferromagnetic state. Finally, we analyze the phase diagram in the interaction-polarization plane under the assumption that only phases with homogeneous magnetization can be produced.

Authors:
;  [1]; ;  [2]
  1. Theoretische Physik, ETH Zurich, CH-8093 Zurich (Switzerland)
  2. Dipartimento di Fisica, Universita di Trento and INO-CNR BEC Center , I-38050 Povo, Trento (Italy)
Publication Date:
OSTI Identifier:
21410912
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 105; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevLett.105.030405; (c) 2010 The American Physical Society; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; COMPUTERIZED SIMULATION; DENSITY; EQUATIONS OF STATE; FERMI GAS; FERROMAGNETISM; INTERACTIONS; INTERATOMIC FORCES; MAGNETIZATION; MONTE CARLO METHOD; PHASE DIAGRAMS; POLARIZATION; POTENTIALS; STABILITY; CALCULATION METHODS; DIAGRAMS; EQUATIONS; INFORMATION; MAGNETISM; PHYSICAL PROPERTIES; SIMULATION

Citation Formats

Pilati, S, Troyer, M, Bertaina, G, and Giorgini, S. Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.105.030405.
Pilati, S, Troyer, M, Bertaina, G, & Giorgini, S. Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study. United States. https://doi.org/10.1103/PHYSREVLETT.105.030405
Pilati, S, Troyer, M, Bertaina, G, and Giorgini, S. 2010. "Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study". United States. https://doi.org/10.1103/PHYSREVLETT.105.030405.
@article{osti_21410912,
title = {Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study},
author = {Pilati, S and Troyer, M and Bertaina, G and Giorgini, S},
abstractNote = {We investigate the phase diagram of a two-component repulsive Fermi gas at T=0 by means of quantum Monte Carlo simulations. Both purely repulsive and resonant attractive model potentials are considered in order to analyze the limits of the universal regime where the details of interatomic forces can be neglected. The equation of state of both balanced and unbalanced systems is calculated as a function of the interaction strength and the critical density for the onset of ferromagnetism is determined. The energy of the strongly polarized gas is calculated and parametrized in terms of the physical properties of repulsive polarons, which are relevant for the stability of the fully ferromagnetic state. Finally, we analyze the phase diagram in the interaction-polarization plane under the assumption that only phases with homogeneous magnetization can be produced.},
doi = {10.1103/PHYSREVLETT.105.030405},
url = {https://www.osti.gov/biblio/21410912}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 3,
volume = 105,
place = {United States},
year = {Fri Jul 16 00:00:00 EDT 2010},
month = {Fri Jul 16 00:00:00 EDT 2010}
}