Imaging backscattering in graphene quantum point contacts

作     者：A. Mreńca-Kolasińska B. Szafran 

作者机构：AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 30-059 Kraków Poland 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2017年第96卷第16期

页      面：165310-165310页

核心收录：

基　　金：Ministry of Science and Higher Education, (11.11.220.01) Narodowe Centrum Nauki, NCN, (DEC-2015/17/B/ST3/01161) 

主　　题：Ballistic transport Graphene Point contacts 

摘      要：We study graphene quantum point contacts (QPCs) and imaging of the backscattering of the Fermi level wave function by potential introduced by a scanning probe. We consider both etched single-layer QPCs as well as the ones formed by bilayer patches deposited on the sides of the monolayer conducting channel. An atomistic tight-binding method is developed to effectively simulate an infinite graphene plane outside the QPCs using a computational box of a finite size. We demonstrate that in spite of the Klein phenomenon interference effects due to the backscattering at a circular n−p junction induced by the probe potential are visible in spatial conductance maps.