(1) Department of Mathematics and Physics, Zhongyuan University of Technology, Zhengzhou, 450007, China;(2) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China
Abstract:
We have calculated the quantum conductance of single-walledcarbon nanotube (SWNT) waveguide by using a tight binding-basedGreens function approach. Our calculations show that the slowconductance oscillations as well as the fast conductanceoscillations are manifestations of the intrinsic quantuminterference properties of the conducting SWNTs, being independentof the defect and disorder of the SWNTs. And zigzag type tubes donot show the slow oscillations. The SWNT electron waveguide isalso found to have distinctly different transport behaviordepending on whether or not the length of the tube is commensuratewith a (3N+1) rule, with N the number of basic carbon repeatunits along the nanotube length.
s function approach. Our calculations show that the slowconductance oscillations as well as the fast conductanceoscillations are manifestations of the intrinsic quantuminterference properties of the conducting SWNTs, being independentof the defect and disorder of the SWNTs. And zigzag type tubes donot show the slow oscillations. The SWNT electron waveguide isalso found to have distinctly different transport behaviordepending on whether or not the length of the tube is commensuratewith a (3N+1) rule, with N the number of basic carbon repeatunits along the nanotube length.