Band-structure and electronic transport calculations in cylindrical wires: the issue of bound states in transfer-matrix calculations

Résultats de recherche: Contribution à un journal/une revueArticle

7 Téléchargements (Pure)

Résumé

The transfer-matrix methodology is used to solve linear systems of differential equations, such as those that arise when solving Schrödinger's equation, in situations where the solutions of interest are in the continuous part of the energy spectrum. The technique is actually a generalization in three dimensions of methods used to obtain scattering solutions in one dimension. Using the layer-addition algorithm allows one to control the stability of the computation and to describe efficiently periodic repetitions of a basic unit. This paper, which is an update of an article originally published in Physical and Chemical News 16, 46-53 (2004), provides a pedagogical presentation of this technique. It describes in details how the band structure associated with an infinite periodic medium can be extracted from the transfer matrices that characterize a single basic unit. The
method is applied to the calculation of the transmission and band structure of electrons subject to cosine potentials in a cylindrical wire. The simulations show that bound states must be considered because of their impact as sharp resonances in the transmission probabilities and to remove unphysical discontinuities in the band structure. Additional states only improve the completeness of the representation.
langue originaleAnglais
Numéro d'article1907.06940
Nombre de pages13
journalArXiv pre-print
Etat de la publicationPublié - 16 juil. 2019

mots-clés

  • transfer matrix
  • bound states
  • band structure
  • electronic transport

Empreinte digitale Examiner les sujets de recherche de « Band-structure and electronic transport calculations in cylindrical wires: the issue of bound states in transfer-matrix calculations ». Ensemble, ils forment une empreinte digitale unique.

Contient cette citation