论文标题
在有吸引力的三色费米子中共存的néel和电荷密度波顺序
Coexisting Néel and charge density wave orders in attractive three-color fermions
论文作者
论文摘要
In optical lattices attractive ultracold fermions with three hyperfine-spin components (colors) can form three fermionic configurations depending on interactions: unbound fermion, on-site trion and off-site trion, leading to the coexistence of multiple Fermi species in the ordered phase, which manifests that the attractive three-color fermions are unique from other correlated fermion systems and may host intriguing phases and phase transitions.在高于超级换量量表的温度下，我们采用了决定量的量子蒙特卡洛（QMC）方法来研究在蜂窝状晶格上，在半填充有吸引力的三色哈伯德模型中，哈伯德相互作用是颜色依赖性的（Anisotropic互动），并在颜色（1，2）之间（1，2），其中Hubbard相互作用是颜色依赖性的（Anisotropic Itsvortions）和两个颜色之间的。在现场和现场TRIONS并存的耦合方案中，我们的QMC模拟显示了共存的Néel和电荷密度波顺序，这在凝结物质中很常见，但在Ultracold原子中很少见。在弱耦合下，颜色超氟（CSF）的顺序散布在颜色-3费米子中，我们发现颜色3与颜色（1，2）的非常小的耦合可以破坏CSF的顺序，而CSF订单的消失并不立即伴随着与现场三位一体的出现，这些偶然性均为相关的态度，这些阶段的态度是刻薄的。还基于直观的物理图片提出了共存电荷/自旋顺序和CSF订单断裂的基本机制。
In optical lattices attractive ultracold fermions with three hyperfine-spin components (colors) can form three fermionic configurations depending on interactions: unbound fermion, on-site trion and off-site trion, leading to the coexistence of multiple Fermi species in the ordered phase, which manifests that the attractive three-color fermions are unique from other correlated fermion systems and may host intriguing phases and phase transitions. At temperature below the superexchange energy scale, we employ the determinant quantum Monte Carlo (QMC) method to investigate the phases and phase transitions in the half-filled attractive three-color Hubbard model on a honeycomb lattice where Hubbard interactions are color-dependent (anisotropic interactions) and the coupling between color 3 and colors (1, 2) serves as a control parameter. In the coupling regime where on-site and off-site trions coexist, our QMC simulations demonstrate coexisting Néel and charge density wave orders which are common in condensed matter but rare in ultracold atoms. At weak coupling where the color superfluid (CSF) order is scattered by color-3 fermions, we find that very small coupling of color 3 with colors (1, 2) can destroy the CSF order and the vanishing of the CSF order is not immediately accompanied by the emergence of the on-site trionic phase, which strikingly disagrees with the prevalent results of dynamical mean-field theory. The underlying mechanisms of the coexisting charge/spin orders and the CSF order breaking are also presented based on intuitive physical pictures.
