Muñoz Enrique, Soto-Garrido Rodrigo
Facultad de Física, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Santiago, Chile.
J Phys Condens Matter. 2017 Nov 8;29(44):445302. doi: 10.1088/1361-648X/aa89bc.
We consider the scattering of Dirac particles in graphene due to the superposition of an external magnetic field and mechanical strain. As a model for a graphene nanobubble, we find exact analytical solutions for single-particle states inside and outside a circular region submitted to the fields. Finally, we obtain analytical expressions for the scattering cross-section, as well as for the Landauer current through the circular region. Our results provide a fully-analytical treatment for electronic transport through a graphene nanobubble, showing that a combination of a physical magnetic field and strain leads to valley polarization and filtering of the electronic current. Moreover, our analytical model provides an explicit metrology principle to measure strain by performing conductance experiments under a controlled magnetic field imposed over the sample.
我们考虑了由于外部磁场和机械应变的叠加而导致的狄拉克粒子在石墨烯中的散射。作为石墨烯纳米气泡的模型，我们找到了在受这些场作用的圆形区域内外单粒子态的精确解析解。最后，我们得到了散射截面以及通过圆形区域的朗道尔电流的解析表达式。我们的结果为通过石墨烯纳米气泡的电子输运提供了一种完全解析的处理方法，表明物理磁场和应变的组合会导致谷极化和电子电流的过滤。此外，我们的解析模型提供了一种明确的计量原理，可通过在施加于样品的受控磁场下进行电导实验来测量应变。
