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首页> 外文期刊>Physical review >Suppression of Kondo screening by the Dicke effect in multiple quantum dots
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Suppression of Kondo screening by the Dicke effect in multiple quantum dots

机译：通过多个量子点的狄克效应抑制近藤筛选

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摘要

The interplay between the coupling of an interacting quantum dot to a conduction band and its connection to localized levels has been studied in a triple quantum-dot arrangement. The electronic Dicke effect, resulting from quasiresonant states of two side-coupled noninteracting quantum dots, is found to produce important effects on the Kondo resonance of the interacting dot. We study in detail the Kondo regime of the system by applying a numerical renormalization-group analysis to a finite- U multi-impurity Anderson Hamiltonian model. We find an extreme narrowing of the Kondo resonance, as the single-particle levels of the side dots are tuned toward the Fermi level and "squeeze" the Kondo resonance, accompanied by a strong drop in the Kondo temperature, due to the presence of a supertunneling state. Further, we show that the Kondo temperature vanishes in the limit of the Dicke effect of the structure. By analyzing the magnetic moment and entropy of the three-dot cluster versus temperature, we identify a different local singlet that competes with the Kondo state, resulting in the eventual suppression of the Kondo temperature and strongly affecting the spin correlations of the structure. We further show that system asymmetries in couplings, level structure or due to Coulomb interactions, result in interesting changes in the spectral function near the Fermi level. These strongly affect the Kondo temperature and the linear conductance of the system.
机译：已经在三重量子点布置中研究了相互作用的量子点与导带的耦合与其与局部能级的连接之间的相互作用。发现由两个侧面耦合的非相互作用量子点的准共振状态产生的电子狄克效应对相互作用点的近藤共振产生重要影响。我们通过将数值重归一化组分析应用于有限U多杂质安德森·汉密尔顿模型来详细研究系统的Kondo体制。我们发现近藤共振极度缩小，因为侧点的单粒子水平朝着费米能级调整并“挤压”近藤共振，伴随着近藤温度的急剧下降，这是由于存在超隧道状态。此外，我们显示近藤温度在结构的迪克效应极限内消失。通过分析三点簇相对于温度的磁矩和熵，我们确定了与近藤状态竞争的不同局部单线态，从而最终抑制了近藤温度，并强烈影响了结构的自旋相关性。我们进一步表明，耦合，能级结构或由于库仑相互作用导致的系统不对称性会导致费米能级附近的光谱函数发生有趣的变化。这些强烈影响近藤温度和系统的线性电导。

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