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arXiv 0903.3590cond-mat.mes-hall
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石墨烯扶手椅型纳米晶体管单电子晶体管:端态的特殊影响

Graphene armchair nanoribbon single-electron transistors: The peculiar influence of end states

Sonja Koller, Leonhard Mayrhofer, Milena Grifoni

摘要:

我们提出了一个相互作用的石墨烯扶手椅型纳米量子点的微观理论。长程相互作用过程是造成库仑阻塞和自旋-电荷分离的原因。短程的,从底层的蜂窝状晶格的石墨烯,涂抹自旋-电荷分离和诱导之间的交换相关性散装电子-离域的带-和单电子本地化在两端。结果,出现了体自旋不再是守恒量的纠缠端体态。纠缠的特征是在一个完全对称的设置中由于量子禁戒跃迁而发生的负微分电导效应。

英文摘要:

We present a microscopic theory for interacting graphene armchair nanoribbon quantum dots. Long range interaction processes are responsible for Coulomb blockade and spin-charge separation. Short range ones, arising from the underlying honeycomb lattice of graphene, smear the spin-charge separation and induce exchange correlations between bulk electrons - delocalized on the ribbon - and single electrons localized at the two ends. As a consequence, entangled end-bulk states where the bulk spin is no longer a conserved quantity occur. Entanglement's signature is the occurrence of negative differential conductance effects in a fully symmetric set-up due to symmetry-forbidden transitions.

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