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arXiv 1409.2263cond-mat.mes-hall
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石墨烯-氮化硼-石墨烯异质结构中扭曲控制的共振隧穿

Twist-controlled resonant tunnelling in graphene-boron nitride-graphene heterostructures

A. Mishchenko, J. S. Tu, Y. Cao, R. V. Gorbachev, J. R. Wallbank, M. T. Greenaway, V. E. Morozov, S. V. Morozov, M. J. Zhu, S. L. Wong, F. Withers, C. R. Woods,… 展开作者

A. Mishchenko, J. S. Tu, Y. Cao, R. V. Gorbachev, J. R. Wallbank, M. T. Greenaway, V. E. Morozov, S. V. Morozov, M. J. Zhu, S. L. Wong, F. Withers, C. R. Woods, Y. -J. Kim, K. Watanabe, T. Taniguchi, E. E. Vdovin, O. Makarovsky, T. M. Fromhold, V. I. Falko, A. K. Geim, L. Eaves, K. S. Novoselov

摘要:

由二维原子晶体制成的范德华异质结构技术的最新发展已经导致了对新物理现象的观察,如金属-绝缘体转变和库仑阻力,以及功能器件的实现,如隧道二极管,隧道晶体管和光伏传感器。不仅通过选择叠层中的材料,而且还通过通过调节组件层的内置应变和相对取向可实现的附加微调,可获得对电子特性的前所未有的控制程度。在这里,我们展示了如何仔细对齐两个石墨烯电极的晶体取向,在晶体管器件中由一层六方氮化硼(hBN)隔开,可以实现共振隧穿,保持电子能量,动量和潜在的手性。我们展示了器件特性中的谐振峰和负微分电导如何引起可调谐的射频振荡电流,该电流具有未来高频技术的潜力。

英文摘要:

Recent developments in the technology of van der Waals heterostructures made from two-dimensional atomic crystals have already led to the observation of new physical phenomena, such as the metal-insulator transition and Coulomb drag, and to the realisation of functional devices, such as tunnel diodes, tunnel transistors and photovoltaic sensors. An unprecedented degree of control of the electronic properties is available not only by means of the selection of materials in the stack but also through the additional fine-tuning achievable by adjusting the built-in strain and relative orientation of the component layers. Here we demonstrate how careful alignment of the crystallographic orientation of two graphene electrodes, separated by a layer of hexagonal boron nitride (hBN) in a transistor device, can achieve resonant tunnelling with conservation of electron energy, momentum and, potentially, chirality. We show how the resonance peak and negative differential conductance in the device characteristics induces a tuneable radio-frequency oscillatory current which has potential for future high frequency technology.

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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