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arXiv 1105.5883cond-mat.str-el
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连接Luttinger液体的Y形接头:固定点结构和电导

Y-junction connecting Luttinger liquids: fixed point structure and conductances

D. N. Aristov, P. Wölfle

摘要:

我们研究了三个Luttinger液体线(可能具有不同的相互作用强度),通过Y-结连接,在散射状态的形式主义的输运性质。首先,我们制定的问题,在当前的代数语言,并专注于对称设置的情况下,散射矩阵和矩阵的电导是由两个变量参数化。对于这些,我们推导出耦合RG方程,首先在阶梯求和到无限阶的相互作用。给出了这些方程的不动点结构和隐式解。结果表明,阶梯近似以外的高阶项不改变不动点附近的标度行为。对于足够强的吸引相互作用,一个新的不动点与不寻常的性质被发现。

英文摘要:

We study the transport properties of three Luttinger liquid wires (with possibly different interaction strength), connected through a Y-junction, within the scattering state formalism. We first formulate the problem in current algebra language and focus on the case of a symmetric set-up, for which the scattering matrix and the matrix of conductances is parametrized by two variables. For these we derive coupled RG equations, first in a ladder summation up to infinite order in the interaction. The fixed point structure and the implicit solution of these equations is presented. It is shown that higher order terms beyond the ladder approximation do not change the scaling behavior near the fixed points. For sufficiently strong attractive interaction a new fixed point with unusual properties is found.

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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