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arXiv 0907.0424cond-mat.mes-hallcond-mat.str-el
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Luttinger液体中不同几何共振能级的对偶性

Duality between different geometries of a resonant level in a Luttinger liquid

Moshe Goldstein, Richard Berkovits

摘要:

利用隧穿项和相互作用证明了Luttinger液相中单能级量子点与量子线的边耦合和嵌入几何之间的精确对偶性。这即使在有限偏置电压存在的情况下也是有效的。在这种关系下,Luttinger液体参数g变为其倒数,并且透射率映射到反射率。然后,我们展示了如何揭示这种对偶性的侧耦合的情况下的传输特性。电导被发现表现出作为能级能量的函数的反共振,其宽度在低温和偏压下当g>1时按照幂律消失(增强输运),并且当g<1时发散(抑制输运)。共振传输总是被破坏,除非g足够大。

英文摘要:

We prove an exact duality between the side-coupled and embedded geometries of a single level quantum dot attached to a quantum wire in a Luttinger liquid phase by a tunneling term and interactions. This is valid even in the presence of a finite bias voltage. Under this relation the Luttinger liquid parameter g goes into its inverse, and transmittance maps onto reflectance. We then demonstrate how this duality is revealed by the transport properties of the side-coupled case. Conductance is found to exhibit an antiresonance as a function of the level energy, whose width vanishes (enhancing transport) as a power law for low temperature and bias voltage whenever g>1, and diverges (suppressing transport) for g<1. On resonance transmission is always destroyed, unless g is large enough.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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