Holographic Kondo and Fano Resonances
Holographic Kondo and Fano Resonances
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全息近藤和法诺共振
DOI：
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发表时间：
2016
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影响因子：
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通讯作者：
Jackson M. S. Wu
中科院分区：
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作者：
J. Erdmenger;C. Hoyos;A. O’Bannon;Ioannis Papadimitriou;Jonas Probst;Jackson M. S. Wu
利用全息术研究了与杂质耦合的（1 + 1）维共形场论。CFT是一个在大N下的SU（N）规范理论，具有强规范相互作用。杂质是SU（N）自旋。我们通过近藤耦合触发杂质重整化群（RG）流。近藤效应只发生在大N平均场跃迁的临界温度以下。我们表明，在所有温度T，杂质光谱函数表现出法诺共振，这在低T阶段是一个大N的近藤共振的表现。因此，我们提供了一个例子中，近藤共振生存强相关性，并揭示了一种新的机制，产生法诺共振，通过（0 + 1）维固定点之间的RG流。
We use holography to study a (1+1)-dimensional conformal field theory (CFT) coupled to an impurity. The CFT is an SU(N) gauge theory at large N, with strong gauge interactions. The impurity is an SU(N) spin. We trigger an impurity renormalization group (RG) flow via a Kondo coupling. The Kondo effect occurs only below the critical temperature of a large-N mean-field transition. We show that at all temperatures T, impurity spectral functions exhibit a Fano resonance, which in the low-T phase is a large-N manifestation of the Kondo resonance. We thus provide an example in which the Kondo resonance survives strong correlations, and uncover a novel mechanism for generating Fano resonances, via RG flows between (0+1)-dimensional fixed points.