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arXiv 1502.03021cond-mat.mes-hall
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库仑耦合量子点电荷电流的热选通

Thermal Gating of Charge Currents with Coulomb Coupled Quantum Dots

Holger Thierschmann, Fabian Arnold, Marcel Mittermüller, Luis Maier, Christian Heyn, Wolfgang Hansen, Hartmut Buhmann, Laurens W. Molenkamp

摘要:

我们观察到了热门控,即热电子引起的静电门控。这种效应发生在由两个电容耦合量子点组成的器件中。双点系统在一侧(QD 1)耦合到热电子库,同时监测第二点(QD 2)的电导。当在QD2上施加偏压时,我们观察到强烈依赖于热库温度的电流。该电流可以被增强或抑制,这取决于QD能级的相对能量对准。因此,该系统可用于通过热电子控制充电电流。

英文摘要:

We have observed thermal gating, i.e. electrostatic gating induced by hot electrons. The effect occurs in a device consisting of two capacitively coupled quantum dots. The double dot system is coupled to a hot electron reservoir on one side (QD1), whilst the conductance of the second dot (QD2) is monitored. When a bias across QD2 is applied we observe a current which is strongly dependent on the temperature of the heat reservoir. This current can be either enhanced or suppressed, depending on the relative energetic alignment of the QD levels. Thus, the system can be used to control a charge current by hot electrons.

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