Negative differential resistance in a molecular junction of carbon nanotube and benzene

Abstract

We propose a novel molecular junction with single-walled carbon nanotubes as electrodes bridged by a benzene molecule, in which the electrodes are saturated by different terminations (C-, H-and N-). It is found that the different terminations at the carbon nanotube ends strongly affect the electronic transport properties of the junction. The current-voltage (I-V) curve of the N-terminated carbon nanotube junction shows a more striking nonlinear feature than that of the C-and H-terminated junctions at small bias. Moreover, the negative differential resistance behaviors can be observed significantly in the N-terminated carbon nanotube junction, whereas not in the other two cases.negative differential resistance, carbon nanotube, electronic transport, non-equilibrium Green's function

Multipeak negative differential resistance from interplay between nonlinear stark effect and double-branch current flow

“…Well pronounced multipeak NDR could be used in the multiple-value memory and logic devices -however, finding a molecule with such characteristics is much more rare than a system with a single-dip in the I-V curve. Single-valley NDR is nowadays a quite popular phenomenon, it has been found in various nanosystems, such as: atomic wires [8,9] and clusters, [10] molecular wires, [11][12][13] molecule-wire combinations, [9,14] molecular monolayers, [15][16][17] aromatic molecules and fullerenes, [18][19][20][21][22] DNA [23] and oligopeptides, [24] organic and metal-organic molecules, [11,12,15,17,[25][26][27][28][29][30][31] magnetic molecules, [11,12,26,30,32,33] graphene field-effect transistors (FET), [34] Fe-doped graphene nanoribbons (GNR), [35] hybrid zigzag SiC-boronphosphide-SiC nanoribbon, [36] bulk GaAs [5] and ZnO nanoparticles. [37] Depending on a system, a variety of mechanisms have been proposed to explain the drop of current under increasing voltage.…”

“…First, the most intuitive descriptions of the NDR effect were associated with the junction breaking and contact or conductor or lead geometry. [8][9][10]12,24 Further, the chemical substitution, 20,23,27 pH of the conductor, 27 and polarization 18 were found to play a role. For magnetic systems, either magnetization and the spin ip, 13,26,32,33 or the Coulomb blockade 32,38 and the spin blockade 32 are suspected to cause the non-monotonic I-V curve behavior.…”

Effects of tip separation and orientation on negative differential resistance in boron-doped carbon-nanotube-based molecular junctions

“…A number of interesting physical properties, including negative differential resistance (NDR) [2][3][4][5][6][7][8][9][10], single-electron characteristics [11], highly nonlinear current-voltage (I-V) relationships [12], rectification [13], and so on, have been found in various kinds of single molecular junctions. The most prominent among these is the NDR effect, which features a rise and fall in current as the applied bias voltage is steadily increased.…”