Quantum-Confined Electronic States in Atomically Well-Defined Graphene Nanostructures
Quantum-Confined Electronic States in Atomically Well-Defined Graphene Nanostructures
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DOI：
10.1103/physrevlett.107.236803
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发表时间：
2011-11-30
影响因子：
8.6
通讯作者：
Liljeroth, Peter
中科院分区：
文献类型：
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作者：
Hamalainen, Sampsa K.;Sun, Zhixiang;Liljeroth, Peter
尽管人们对石墨烯的性质和石墨烯纳米结构在电子应用中的潜力有着极大的兴趣，但在原子定义良好的石墨烯纳米结构中的量子限制态的研究仍然是一个实验挑战。在这里，我们研究了石墨烯量子点（GQD）与明确的边缘在锯齿形方向，通过低温扫描隧道显微镜和光谱学的Ir（111）衬底上的化学气相沉积生长。我们测量了单个GQD的原子结构和局域态密度，作为它们的尺寸和形状的函数，范围从几纳米到大约100纳米。20纳米。结果可以用相对论波动方程和原子紧束缚计算进行定量模拟。观察到的状态类似于教科书中“盒子中的粒子”问题应用于相对论性无质量费米子的解决方案。
Despite the enormous interest in the properties of graphene and the potential of graphene nanostructures in electronic applications, the study of quantum-confined states in atomically well-defined graphene nanostructures remains an experimental challenge. Here, we study graphene quantum dots (GQDs) with well-defined edges in the zigzag direction, grown by chemical vapor deposition on an Ir(111) substrate by low-temperature scanning tunneling microscopy and spectroscopy. We measure the atomic structure and local density of states of individual GQDs as a function of their size and shape in the range from a couple of nanometers up to ca. 20 nm. The results can be quantitatively modeled by a relativistic wave equation and atomistic tight-binding calculations. The observed states are analogous to the solutions of the textbook "particle-in-a-box'' problem applied to relativistic massless fermions.