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From Coulomb blockade to the Kondo regime in a Rashba dot

机译:从库仑封锁到Rashba点的近藤政权

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摘要

We investigate the electronic transport in a quantum wire with localized Rashba interaction. The Rashba field forms quasibound states that couple to the continuum states with an opposite spin direction. The presence of this Rashba dot causes Fano-like antiresonances and dips in the wire's linear conductance. The Fano line shape arises from the interference between the direct transmission channel along the wire and the hopping through the Rashba dot. Due to the confinement, we predict the observation of large charging energies in the local Rashba region, which lead to Coulomb-blockade effects in the transport properties of the wire. Importantly, the Kondo regime can be achieved with a proper tuning of the Rashba interaction, giving rise to an oscillating linear conductance for a fixed occupation of the Rashba dot.
机译:我们研究具有局部Rashba相互作用的量子线中的电子传输。 Rashba场形成准结合态,其以相反的自旋方向耦合到连续态。该Rashba点的存在会引起Fano类反共振,并会降低导线的线性电导。 Fano线的形状是由沿导线的直接传输通道与通过Rashba点的跳变之间的干扰引起的。由于局限性,我们预测在当地的Rashba地区会观察到较大的充电能量,这会导致电线的传输性能受到库仑阻挡作用。重要的是,可以通过适当调整Rashba相互作用来实现近藤控制,从而为固定占据Rashba点产生振荡线性电导。

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