三维光晶格中 SU(4)- 对称费米气体中各向异性驱动的磁相变

IF 1.5 4区物理与天体物理 Q3 OPTICS

Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-08-30 DOI:10.1088/1361-6455/ad6b63

Vladyslav Unukovych, Andrii Sotnikov

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引用次数: 0

摘要

我们研究了立方光晶格中的苏(4)对称超冷费米子混合物，在从二维空间几何到三维空间几何的交叉区域中，该混合物沿着一条特定的晶轴具有可变的隧穿振幅。为了从理论上分析新出现的磁相和物理观测值，我们在费米-哈伯德模型的框架内描述了该系统，并应用了动态均场理论。我们的研究表明，在两种各向异性的极限情况下，零温极限存在两种具有不同反铁磁有序性的磁相，并确定了它们共存的区域。我们还研究了不同磁有序态的稳定区域以及谐波光学陷阱中气体的密度剖面。

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Anisotropy-driven magnetic phase transitions in SU(4)-symmetric Fermi gas in three-dimensional optical lattices

We study an SU(4)-symmetric ultracold fermionic mixture in a cubic optical lattice with a variable tunneling amplitude along one particular crystallographic axis in the crossover region from the two- to three-dimensional spatial geometry. To theoretically analyze the emerging magnetic phases and physical observables, we describe the system within the framework of the Fermi–Hubbard model and apply dynamical mean-field theory. We show that in two limiting cases of anisotropy, there are two phases with different antiferromagnetic orderings in the zero temperature limit and we determine a region of their coexistence. We also study the stability regions of different magnetically ordered states and density profiles of the gas in the harmonic optical trap.

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来源期刊

Journal of Physics B: Atomic, Molecular and Optical Physics 物理-光学

CiteScore

3.60

自引率

6.20%

发文量

182

审稿时长

2.8 months

期刊介绍： Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.