Anisotropic quantum transport in two dimension – hints of emergence of a metallic behaviour
Indian Institute of Technology Guwahati,
Received: 8 January 2015
Received in final form: 9 March 2015
Published online: 13 April 2015
We have compared and contrasted between the diagonal and off-diagonal disorder with regard to the conductance of a two dimensional conducting system. The diagonal (onsite) disorder is found to be more predictable in the sense that the conductivity gradually vanishes as the disorder strength is enhanced. A few of the physical quantities such as the participation ratio and the correlation length, etc. directly correlate with the localization length of a strongly disordered conductor. Such an intuitive picture is found to be absent for the off diagonal (hopping) disorder. The hopping disorder strongly enhances the conductance properties even in the weak localization regime and surprisingly yields metallic conductivity at large disorder values.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2015