Itinerant ferromagnetism of repulsive two-component Fermi gas in the triple-well traps

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• 作者：Zongli Sun (1) (2)
  
  1. Department of Physics ; University of Science and Technology Beijing ; Beijing ; 100083 ; P.R. China
  2. Science and Technology College ; North China Electric Power University ; Baoding ; 071051 ; P.R. China
  
• 关键词：Cold Matter and Quantum Gas
• 刊名：The European Physical Journal D - Atomic, Molecular and Optical Physics
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：68
• 期：6
• 全文大小：343 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Atoms, Molecules, Clusters and Plasmas
  Nanotechnology
  Quantum Physics
  Quantum Computing, Information and Physics
  Complexity
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1434-6079

文摘

Based on Thomas-Fermi density functional theory, itinerant ferromagnetism of repulsive two-component Fermi gas trapped in a triple-well is studied. The density profiles of the two components are calculated in three types of triple-well trapping potential. The conclusion is drawn that phase separation relates closely not only to the interaction strength, but also to the shape of the trapping potential, which plays a critical role in determining the density profile of the gas. The separation in each type of trapping potential is a result of the competition between repulsive interaction energy and the kinetic energy. Numerical results show that phase separation occurs once the coupling constant reaches a critical value. With further increase in the coupling constant, the interplay between wells is enhanced, which may cause complex separation. Despite our crude treatment in the Thomas-Fermi approximation, the results may help to explore and understand the nature of itinerant ferromagnetism of trapped Fermi mixtures in both theoretical and experimental research in the future.