In this Letter, we demonstrate coupled double-quantum dot (DQD)-like transport in an $\sim 30$ nm-wide controllably doped graphene nanoribbon (GNR). Controlled doping is introduced from hydrogen silsesquioxane by changing its electron exposure dose. The proximity effect, which brings in additional dose accumulation, is utilized to introduce two charge puddles with stronger p-doping at the two ends of the moderately p-doped GNR, which act as two quantum dots. By electrostatically isolating these two charge puddles with simplified overlapping dual gates, DQD-like transport features are measured in the doped GNR at a temperature of 5 K. Moreover, the transition from strongly to weakly coupled DQDs is observed due to electrically tunable inter-dot coupling.

中文翻译：

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可控掺杂石墨烯纳米带中的双量子点状传输

在这封信中，我们演示了耦合双量子点（DQD）形式的传输 $〜30$ 纳米级可控掺杂的石墨烯纳米带（GNR）。通过改变氢倍半硅氧烷的电子暴露剂量从氢倍半硅氧烷中引入受控掺杂。利用带来额外剂量累积的邻近效应，在中等p掺杂的GNR的两个末端引入两个具有更强p掺杂的电荷坑，它们充当两个量子点。通过用简化的重叠双栅极将这两个电荷坑静电隔离，可以在5 K的温度下在掺杂的GNR中测量DQD状的传输特性。此外，由于电可调点间的存在，观察到了从强耦合到弱耦合的DQD的转变。耦合。