Pressure variation of Luttinger liquids parameters in single wall carbon nanotubes networks

TL;DR

This study investigates how pressure influences the Luttinger liquid parameters in single-wall carbon nanotube networks, revealing pressure-induced charge transfer effects and variations in electronic interactions.

Contribution

It provides experimental insights into pressure-dependent Luttinger liquid parameters and methods to distinguish bulk and end contributions in nanotube networks.

Findings

Pressure causes sample-dependent changes in the Luttinger parameter alpha.

Pressure induces charge transfer affecting the Fermi level.

Methods to determine alpha_bulk and alpha_end were demonstrated.

Abstract

We measure electrical transport on networks of single wall nanotube of different origin as a function of temperature T, voltage V and pressure P . We observe Luttinger liquid (LL) behavior, a conductance T^alpha and a dynamic conductance V^alpha . We observe a sample dependent P variation of the alpha parameters, interpreted as fermi level changes due to pressure induced charge transfer. We show how, through standard four-leads and crossed configuration methods, it is possible to determine alpha_bulk and alpha_end, respectively. We study and discuss the pressure and doping level dependences of the number of channels N, the LL parameter g and the intra-rope tube-tube coupling constant U .