Marcio G. da Silva | Searcharxiv

arXiv2020

Effect of carbon nanotube on ballistic conduction through single-quantum-dot

We will study the competitive effect between the transport of a quantum dot adsorbed to a ballistic channel and laterally coupled to a single-walled carbon nanotube (SWNT). We will use the tight-binding approach to analytically write the SWNT Green function and the quantum dot will be solved by the atomic method for U very large. We will present curves of the electronic density of states for some different sizes of nanotubes. The results for the conductance curves will be presented as a function of Ef and for different values of n and hopping between the nanotube and the quantum dot.

cond-mat.mes-hall↗

arXiv2019

Carbon nanotube with pressure inducing pseudogaps: Kondo effect study

In this work we are interested to studying the Kondo effect present in a system with a $T$-shape ligation between a single-wall carbon nanotube (SWNT) and a magnetic impurity. The system has been studied under hydrostatic pressure and it was observed the opening of the gap in the density of states of the zigzag metallic tube. The pressure can be modeled by the Pierls instability and in this work we consider the out-of-plane distortion. A tight-binding approximation is used to calculate the SWNT Green's functions with hydrostatic pressure applied. We studied the disappearance of the Kondo peak as the gap opens. Moreover, we observed the strong influence of the pressure in the conductance curve that can be explained by the variation of Kondo peak height. The Kondo effect was reproduced with the atomic approach with $U\rightarrow\infty$ developed previously. Results of the electronic density of states and curves of the conductance are presented.

cond-mat.str-el↗