论文标题
石墨烯中dirac准粒子的量子限制，用亚纳光精度图案化
Quantum confinement of Dirac quasiparticles in graphene patterned with subnanometer precision
论文作者
论文摘要
在人工制作的纳米结构中，像石墨烯一样的类似石墨烯的零食限制是一个备受追捧的目标，它将提供一种策略，以选择性地调整石墨烯的电子特性，包括开放或量化能量水平的量子，但是，在形状，尺寸和位置上创建限制结构，在形状，尺寸和位置上仍然是实验挑战，无论是在实验中还是可以使用，都可以使用额外的挑战。此外，Klein Tunneling，提供通往石墨烯电子的逃生路线，限制了静电限制的效率。在这里，扫描隧道显微镜（STM）用于通过集体操纵大量的H原子来创建具有子纳米精度的石墨烯纳米图案。单个石墨烯纳米结构是在选定的位置建造的，具有预定的方向和形状，并且尺寸从2纳米到1微米的2纳米一直延伸。该方法允许随意擦除和重建模式，并且可以在不同的石墨烯基板上实现。 STM实验表明，这种石墨烯纳米结构将非常有效的石墨烯狄拉克清单固定在零和一个维结构中。在石墨烯量子点中，发现了完美定义的能带缝隙最高为0.8 eV，该比例是点线性尺寸的倒数，如无质量的dirac fermions所期望的那样
Quantum confinement of graphene Dirac-like electrons in artificially crafted nanometer structures is a long sought goal that would provide a strategy to selectively tune the electronic properties of graphene, including bandgap opening or quantization of energy levels However, creating confining structures with nanometer precision in shape, size and location, remains as an experimental challenge, both for top-down and bottom-up approaches. Moreover, Klein tunneling, offering an escape route to graphene electrons, limits the efficiency of electrostatic confinement. Here, a scanning tunneling microscope (STM) is used to create graphene nanopatterns, with sub-nanometer precision, by the collective manipulation of a large number of H atoms. Individual graphene nanostructures are built at selected locations, with predetermined orientations and shapes, and with dimensions going all the way from 2 nanometers up to 1 micron. The method permits to erase and rebuild the patterns at will, and it can be implemented on different graphene substrates. STM experiments demonstrate that such graphene nanostructures confine very efficiently graphene Dirac quasiparticles, both in zero and one dimensional structures. In graphene quantum dots, perfectly defined energy band gaps up to 0.8 eV are found, that scale as the inverse of the dots linear dimension, as expected for massless Dirac fermions
