Synthesis of SWCNT rings made by two Y junctions and possible applications in electron interferometry

A ringlike single walled carbon nanotube (SWCNT) system made by two Y junctions naturally connected to nanotube systems generated inside the microscope under intense irradiation at 800°C was synthesized and its applications in optical interferometry were presented. The formation of standing waves in the arms of ringlike nanostructures show that the π-band tight-binding Hamiltonian depends on a sum over all lattice sites in terms of the electron creation and annihilation. The electronic wave-function reflections in the right and left stem of SWCNT takes place at both Y-birfucations, leading to oscillatory local density of states (LDOS) patterns around the van Hove singularity energies of the isolated tubes. The effective Y-junction ring (YJR)-brace barrier diminishes due to tunneling processes through defects, leading to finite conductance values inside the semiconducting gap.