Investigation of Heat Capacity and Magnetic Susceptibility of Carbon Nanodiscs and Nanowires in Tight-binding Approximation

Document Type : Full length research Paper

Authors

Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran

Abstract

In this study, the density of states, heat capacity, and magnetic susceptibility of carbon nanodiscs and nanowires with different diameters are calculated via the tight-binding approximation and the Green’s function approach. The results indicate that by increasing the diameter, the nanodiscs move from a semi-conductive and tend toward a semi-metal which is in agreement with other theoretical works. Also, increasing the diameter of the nanowires causes them to exhibit a metallic behavior. It is observed that increasing the diameter of these nanostructures increases the number of the Van Hove singularities in the density of states diagrams. A Schottky anomaly peak is seen in the heat capacity curves of these two nanostructures, which for the nanodisc/nanowire with the largest diameter, has a lower height. Due to the presence of the Van Hove singularities in the density of states diagram, a crossover is seen in the magnetic susceptibility curves, which splits these diagrams into two high temperature and low temperature regions. It is also concluded that at low temperatures, increase in the diameter of the nanodiscs and nanowires increases the magnetic susceptibility. These maximum values are also observed in the heat capacity and magnetic susceptibility curves of other graphene and graphene-like nanostructures.

Keywords

Main Subjects

References

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Journal of Research on Many-body Systems
Volume 11, Issue 2 - Serial Number 29
September 2021
Pages 121-138

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History

  • Receive Date: 16 June 2020
  • Revise Date: 29 June 2021
  • Accept Date: 04 August 2021

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