Asymptotic correlation functions and FFLO signature for the one-dimensional attractive Hubbard model

Asymptotic correlation functions and FFLO signature for the one-dimensional attractive Hubbard model
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一维吸引力 Hubbard 模型的渐近相关函数和 FFLO 签名

DOI:
10.1016/j.nuclphysb.2018.02.016
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发表时间:
2017-10
期刊:
影响因子:
2.8
通讯作者:
Guan Xi-Wen
Guan Xi-Wen
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Cheng Song;Jiang Yuzhu;Yu Yi-Cong;Batchelor Murray T.;Guan Xi-Wen

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利用Bethe ansatz和共形场论方法,研究了一维吸引Hubbard模型在部分极化相位下的各种相关函数的远距离渐近行为。我们特别发现了这些具有空间幂律衰减的相关函数的振荡行为,其中对(自旋)相关函数以频率Δ k F (2 Δ k F)振荡。其中Δ k F= π (n↑−n↓)是自旋向上和自旋向下粒子的费米表面的不匹配。因此,动量空间中的对相关函数在不匹配k= Δ k F处有峰值,这在最近对该模型的数值研究中已经观察到。这些动量空间中的奇异峰与空间振荡表明了一维Hubbard模型中Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)状态的模拟。代表晶格效应的参数β在决定所有相关函数幂律衰减的关键指数中变得突出。我们指出,未配对费米子和束缚费米子在它们自己的费米点内的后向散射给出了一维FFLO配对的微观起源。
We study the long-distance asymptotic behavior of various correlation functions for the one-dimensional (1D) attractive Hubbard model in a partially polarized phase through the Bethe ansatz and conformal field theory approaches. We particularly find the oscillating behavior of these correlation functions with spatial power-law decay, of which the pair (spin) correlation function oscillates with a frequency Δ k F (2 Δ k F). Here Δ k F= π (n↑− n↓) is the mismatch in the Fermi surfaces of spin-up and spin-down particles. Consequently, the pair correlation function in momentum space has peaks at the mismatch k= Δ k F, which has been observed in recent numerical work on this model. These singular peaks in momentum space together with the spatial oscillation suggest an analog of the Fulde–Ferrell–Larkin–Ovchinnikov (FFLO) state in the 1D Hubbard model. The parameter β representing the lattice effect becomes prominent in critical exponents which determine the power-law decay of all correlation functions. We point out that the backscattering of unpaired fermions and bound pairs within their own Fermi points gives a microscopic origin of the FFLO pairing in 1D.
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