Electrical control of charged carriers and excitons in atomically thin materials
Electrical control of charged carriers and excitons in atomically thin materials
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DOI：
10.1038/s41565-017-0030-x
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发表时间：
2018-01
影响因子：
38.3
通讯作者：
Ke Wang;K. De Greve;L. Jauregui;A. Sushko;A. High;You Zhou;Giovanni Scuri;T. Taniguchi;Kenji Watanabe;M. Lukin;Hongkun Park;P. Kim
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文献类型：
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作者：
Ke Wang;K. De Greve;L. Jauregui;A. Sushko;A. High;You Zhou;Giovanni Scuri;T. Taniguchi;Kenji Watanabe;M. Lukin;Hongkun Park;P. Kim
半导体纳米结构中载流子的电约束和操纵对于实现功能量子电子器件是必不可少的。原子薄的过渡金属二硫属化物（TMD）的独特能带结构为实现新型二维量子电子器件（如谷电子器件和谷自旋量子比特）提供了一条新的途径。2D TMD还提供了一个平台，用于新的量子光电器件，由于其大的激子结合能，。然而，由于材料中普遍存在的无序，TMD纳米结构中电子和激子激发的控制限制和操纵在技术上具有挑战性，从而阻止了局部限制和隧道耦合的精确实验控制。在这里，我们展示了一种新的方法，用于创建高品质的异质结构组成的原子级薄的材料，允许有效的电控制的激发。具体来说，我们证明了量子输运的栅极定义，量子限制区，观察自旋谷锁定量子点接触的量子化电导。我们还实现了与电子限制相关的门控库仑阻塞，并展示了带电激子的电控制与可调局部限制电位和隧道耦合。我们的工作为基于带电载流子和激子操纵的新型量子光电器件提供了基础。
Electrical confinement and manipulation of charge carriers in semiconducting nanostructures are essential for realizing functional quantum electronic devices, –. The unique band structure, , –of atomically thin transition metal dichalcogenides (TMDs) offers a new route towards realizing novel 2D quantum electronic devices, such as valleytronic devices and valley–spin qubits. 2D TMDs also provide a platform for novel quantum optoelectronic devices, –due to their large exciton binding energy,. However, controlled confinement and manipulation of electronic and excitonic excitations in TMD nanostructures have been technically challenging due to the prevailing disorder in the material, preventing accurate experimental control of local confinement and tunnel couplings, –. Here we demonstrate a novel method for creating high-quality heterostructures composed of atomically thin materials that allows for efficient electrical control of excitations. Specifically, we demonstrate quantum transport in the gate-defined, quantum-confined region, observing spin–valley locked quantized conductance in quantum point contacts. We also realize gate-controlled Coulomb blockade associated with confinement of electrons and demonstrate electrical control over charged excitons with tunable local confinement potentials and tunnel couplings. Our work provides a basis for novel quantum opto-electronic devices based on manipulation of charged carriers and excitons.