Multichannel Kondo effect in an interacting electron system: Exact results for the low-temperature thermodynamics

Article

关键词: CONFORMAL-FIELD-THEORY;    LUTTINGER LIQUID;    FUSION RULES;    BEHAVIOR;    MODEL;   

DOI  :  10.1103/PhysRevB.57.987

来源: SCIE

【 摘 要 】

We study the low-temperature thermodynamics of a spin-S magnetic impurity coupled to m greater than or equal to 2 degenerate bands of interacting electrons in one dimension. By exploiting boundary-conformal-field-theory techniques, we derive exact results for the possible impurity thermal and magnetic response. The leading behavior of the impurity magnetic susceptibility is shown to be insensitive to the electron-electron interaction. In contrast, there are two types of scaling behavior of the impurity specific heat consistent with the symmetries of the problem: Either it remains the same as for the ordinary multichannel Kondo problem for noninteracting electrons or it acquires a new leading term governed by a critical exponent alpha(m)=(g(m)(-1)-1)/m, where g(m) less than or equal to 1 is a generalized (m channel) Luttinger-liquid charge parameter measuring the strength of the repulsive electron-electron interaction. We conjecture that the latter behavior is indeed realized when the impurity is exactly screened (m=2S). [S0163-1829(98)05002-4].

【 授权许可】

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