首页|Group delay time of fermions in graphene through tilted potential barrier
Group delay time of fermions in graphene through tilted potential barrier
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NSTL
Springer Nature
Abstract The group delay time of Dirac fermions subjected to a tilting barrier potential along the x-axis is investigated in graphene. We start by finding the eigenspinor solution of the Dirac equation and then relating it to incident, reflected, and transmitted beam waves. This relationship allows us to compute the group delay time in transmission and reflection by obtaining the corresponding phase shifts. We discovered that the barrier width, incident energy, and incident angle can all be used to modify the group delay time, and that the particles travel through the barrier at the Fermi velocity vF\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ v_F $$\end{document}. Our findings also show that the transmission group delay might be controlled, and that gate voltage control could be useful in graphene-based tilting barriers.Graphical abstract FIG. 1. (color online) The group delay time in transmission tt/t0 as a function of the barrier width d for V0 = V1 = 80 meV, f = 30°\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$30^\circ $$\end{document} , E = 20 meV (blue line), E = 25 meV (red line), and E = 30 meV (green line).
NSTL
Springer Nature
