Fano effect and bound state in continuum in electron transport through an armchair graphene nanoribbon with line defect
1 College of Sciences, Northeastern University, Shenyang 110004, China
2 Department of Physics, Jilin University, Changchun 130023, China
Nanoscale Research Letters 2013, 8:330 doi:10.1186/1556-276X-8-330Published: 22 July 2013
Electron transport properties in an armchair graphene nanoribbon are theoretically investigated by considering the presence of line defect. It is found that the line defect causes the abundant Fano effects and bound state in continuum (BIC) in the electron transport process, which are tightly dependent on the width of the nanoribbon. By plotting the spectra of the density of electron states of the line defect, we see that the line defect induces some localized quantum states around the Dirac point and that the different localizations of these states lead to these two kinds of transport results. Next, the Fano effect and BIC phenomenon are detailedly described via the analysis about the influence of the structure parameters. According to the numerical results, we propose such a structure to be a promising candidate for graphene nanoswitch.
81.05.Uw, 71.55.-i, 73.23.-b, 73.25.+i