Overscreened Kondo effect, (color) superconductivity, and Shiba states in Dirac metals and quark matter

Takuya Kanazawa, Shun Uchino

研究成果: Article査読

19 被引用数 (Scopus)

抄録

We study the interplay between the Kondo effect and (color) superconductivity in doped Dirac metals with magnetic impurities and in quark matter with colorful impurities. We first point out that the overscreened Kondo effect arises in the normal state of these systems. Next the (color) superconducting gap is incorporated as a mean field and the phase diagram for a varying gap and temperature is constructed nonperturbatively. A rich phase structure emerges from a competition of effects unique to a multichannel system. The Kondo-screened phase is shown to disappear for a sufficiently large gap. Peculiarity of quark matter due to the confining property of non-Abelian gauge fields is noted. We also investigate the spectrum of sub-gap excited states, called Shiba states. Based on a model calculation and physical reasoning we predict that, as the coupling of the impurity to the bulk is increased, there will be more than one quantum phase transition due to level crossing among overscreened states.

本文言語English
論文番号114005
ジャーナルPhysical Review D
94
11
DOI
出版ステータスPublished - 2016 12 5

ASJC Scopus subject areas

  • 物理学および天文学(その他)

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