Some calculational improvements in applying the Hubbard model to nanomaterials

19th International School on Condensed Matter Physics: Advances in Nanostructured Condensed Matter: Research and Innovations

Celebonovic, Vladan^1

Institute of Physics, University of Belgrade, Pregrevica 118, Belgrade

11080, Serbia^1

关键词: 2-D systems;    High pressure;    Hubbard;    Imaginary parts;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/794/1/012008/pdf
DOI  :  10.1088/1742-6596/794/1/012008

来源: IOP

【 摘 要 】

John Hubbard proposed "his model" (HM) nearly sixty years ago, and one could be tempted to expect that everything (or almost so) about it is well known. Quite to the contrary, the HM is still arising interest and its applicability seems to be rising. The aim of this paper is to discuss several examples of new or already existing but improved results concerning the 2D HM and its applicability to nanomaterials. The following issues will be discussed: increasing the number of terms in various expressions used in calculating the conductivity; introducing the strain in these expressions ( which is important for experiments under high pressure); defining the pressure in a 2D system and calculating the reflectivity but taking into account the imaginary part of the conductivity.