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Effects of frustration on the anisotropic triangular lattice bosons

机译:挫折对各向异性三角晶玻色子的影响

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We study the extended hard-core Bose-Hubbard model with nearest-neighbor interactions on a triangular lattice with spatial anisotropy by quantum Monte Carlo simulations. The effects of the geometric frustration or the anisotropic strength, represented by the ratio t'/t between the intrachain nearest-neighbor hopping t' and the interchain hopping t, are studied. We find that for small values of anisotropy ratio t' /t, a solid state emerges at ρ=1/2 and a supersolid is unstable toward phase separation; for large values of anisotropy ratio t' /t, solid states emerge at ρ=1/-3, 2/3, and a supersolid phase is stable in the region ρ< 2/3; for intermediate values of anisotropy ratio t'It, three kinds of solid states at fillings ρ=1/3, 1/2, and ρ=2/3 coexist and no stable supersolid phase is observed. At half filling, we find that with increasing frustration t' /t, the ρ=1/2 solid transitions indirectly into the supersolid via an intervening superfluid.
机译:我们通过量子蒙特卡洛模拟研究了具有空间各向异性的三角晶格上具有最近邻相互作用的扩展硬核Bose-Hubbard模型。研究了由链内最邻近跳变t'与链间跳变t之间的比率t'/ t表示的几何挫折或各向异性强度的影响。我们发现,对于较小的各向异性比率t'/ t,固态出现在ρ= 1/2处,而超固态则对相分离不稳定。对于较大的各向异性比率t'/ t,固态出现在ρ= 1 / -3、2 / 3,并且超固态在ρ<2/3区域稳定。对于各向异性比率t'It的中间值,填充物ρ= 1 / 3、1 / 2和ρ= 2/3的三种固态共存,没有观察到稳定的超固相。在半填充时,我们发现随着挫折t'/ t的增加,ρ= 1/2固体通过中间的超流体间接转变为超固体。

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