Scaling approach to tight-binding transport in realistic graphene devices: The case of transverse magnetic focusing
Scaling approach to tight-binding transport in realistic graphene devices: The case of transverse magnetic focusing
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DOI：
10.1103/physrevb.94.115441
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发表时间：
2016-09-30
影响因子：
3.7
通讯作者：
Taddei, F.
中科院分区：
文献类型：
--
作者：
Beconcini, M.;Valentini, S.;Taddei, F.
封装在六方氮化硼晶体之间的超净石墨烯片托管二维电子系统，其中低温传输仅受样品尺寸的限制。我们重新进行微观计算的非局部弹道输运在这样的微米级设备的理论问题。通过采用Landauer-Buttiker散射理论，我们提出了一种在现实的石墨烯器件中的紧束缚非局域输运的标度方法。我们测试我们的数值方法对实验数据的横向磁聚焦（ESTA），教科书的例子，在横向磁场的存在下的非局部弹道输运。这种比较能够对所有观测到的射电信号特征进行清晰的物理解释，包括其振荡符号。
Ultraclean graphene sheets encapsulated between hexagonal boron nitride crystals host two-dimensional electron systems in which low-temperature transport is solely limited by the sample size. We revisit the theoretical problem of carrying out microscopic calculations of nonlocal ballistic transport in such micron-scale devices. By employing the Landauer-Buttiker scattering theory, we propose a scaling approach to tight-binding nonlocal transport in realistic graphene devices. We test our numerical method against experimental data on transverse magnetic focusing ( TMF), a textbook example of nonlocal ballistic transport in the presence of a transverse magnetic field. This comparison enables a clear physical interpretation of all the observed features of the TMF signal, including its oscillating sign.