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arXiv 1012.0374cond-mat.mes-hall
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利用库仑阻塞光谱成像石墨烯中的电荷密度波动

Imaging charge density fluctuations in graphene using Coulomb blockade spectroscopy

A. Deshpande, W. Bao, H. Zhang, Z. Zhao, C. N. Lau, B. J. LeRoy

摘要:

使用扫描隧道显微镜,我们已经成像的单层石墨烯的局部电荷密度波动。通过在STM针尖的末端放置一个小的金纳米颗粒,就可以创建一个电荷传感器。通过在表面上光栅扫描尖端并使用库仑阻塞光谱,我们绘制了石墨烯上的局部电荷。我们观察到一系列的电子和空穴掺杂的水坑与特征长度尺度约为20 nm。基于杂质数的关联长度的理论计算与我们的测量结果一致。

英文摘要:

Using scanning tunneling microscopy, we have imaged local charge density fluctuations in monolayer graphene. By placing a small gold nanoparticle on the end of the STM tip, a charge sensor is created. By raster scanning the tip over the surface and using Coulomb blockade spectroscopy, we map the local charge on the graphene. We observe a series of electron and hole doped puddles with a characteristic length scale of about 20 nm. Theoretical calculations for the correlation length of the puddles based on the number of impurities are in agreement with our measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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