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首页> 外文期刊>Physical review >Transport properties of a molecule embedded in an Aharonov-Bohm interferometer
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Transport properties of a molecule embedded in an Aharonov-Bohm interferometer

机译：嵌入在Aharonov-Bohm干涉仪中的分子的传输性质

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摘要

We theoretically investigate the transport properties of a molecule embedded in one arm of a mesoscopic Aharonov-Bohm interferometer. Due to the presence of phonons the molecule level position (ε_d) and the electron-electron interaction (U) undergo a polaronic shift, which affects dramatically the electronic transport through the molecular junction. When the electron-phonon interaction is weak the linear conductance presents Fano-line shapes as long as the direct channel between the electrodes is opened. The observed Fano resonances in the linear conductance are originated from the interference between the spin Kondo state and the direct path. For strong enough electron-phonon interaction, the electron-electron interaction is renormalized toward negative values, i.e., becomes effectively attractive. This scenario favors fluctuations between the empty and doubly occupied charge states and therefore promotes a charge Kondo effect. However, the direct path between the contacts breaks the electron-hole symmetry, which can efficiently suppress this charge Kondo effect. Nevertheless, we show that a proper tuning of the gate voltage is bale to revive the Kondo resonance. Our results are obtained by using the Numerical Renormalization approximation to compute the electronic spectral function and the linear conductance.
机译：我们从理论上研究了嵌入介观Aharonov-Bohm干涉仪的一个臂中的分子的传输特性。由于存在声子，分子能级位置（ε_d）和电子-电子相互作用（U）经历了极化运动，这极大地影响了通过分子结的电子传输。当电子-声子相互作用较弱时，只要打开电极之间的直接通道，线性电导就呈现Fano-line形状。线性电导中观察到的Fano共振源自自旋近藤状态和直接路径之间的干扰。对于足够强的电子-声子相互作用，将电子-电子相互作用朝负值重新归一化，即变得有效地吸引。这种情况有利于空电荷状态和双重占据电荷状态之间的波动，因此会促进电荷近藤效应。然而，接触之间的直接路径破坏了电子-空穴的对称性，这可以有效地抑制这种电荷近藤效应。然而，我们表明，适当地调整栅极电压可以恢复近藤共振。我们的结果是通过使用数值重归一化近似来计算电子光谱函数和线性电导而获得的。

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