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arXiv 0810.4163cond-mat.str-elcond-mat.mes-hall
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一维量子液体中杂质的色散关系和光谱函数

Dispersion relation and spectral function of an impurity in a one-dimensional quantum liquid

Austen Lamacraft

摘要:

本文考虑零温下一般一维量子流体中杂质粒子的运动。当动量接近$\pmπ\hbar n, \pm 3π\hbar n, ...$时,杂质的色散关系$Ω(P)$受到与流体的相互作用的强烈影响,其中$n$是密度。这种行为是由奇异的$\pm 2π\hbar n$散射过程引起的,并且可以通过类比近藤效应来理解,无论是在强耦合还是弱耦合下,都有可能发生量子相变,其中$Ω'(\pm πn)$随着耦合的增加而跳到零。杂质谱函数中的低能奇异性也可以在同样的基础上理解。

英文摘要:

We consider the motion of an impurity particle in a general one-dimensional quantum fluid at zero temperature. The dispersion relation $Ω(P)$ of the impurity is strongly affected by interactions with the fluid as the momentum approaches $\pmπ\hbar n, \pm 3π\hbar n, ...$, where $n$ is the density. This behavior is caused by singular $\pm 2π\hbar n$ scattering processes and can be understood by analogy to the Kondo effect, both at strong and weak coupling, with the possibility of a quantum phase transition where $Ω'(\pm πn)$ jumps to zero with increasing coupling. The low energy singularities in the impurity spectral function can be understood on the same footing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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