Open AccessA Review Of The Linear Response Function In Condensed Matter Physics And Their Application In Some Elementary Processes
Author(s) -
Ibnu Jihad,
Kamsul Abraha
Publication year - 2020
Publication title -
jurnal fisika indonesia
Language(s) - English
Resource type - Journals
eISSN - 2579-8820
pISSN - 1410-2994
DOI - 10.22146/jfi.v20i3.56138
Subject(s) - physics , linear response theory , quantization (signal processing) , magnetic susceptibility , magnetic field , wave function , function (biology) , electric susceptibility , dispersion relation , quantum field theory , quantum mechanics , tensor (intrinsic definition) , statistical physics , mathematics , condensed matter physics , pure mathematics , magnetization , polarization density , algorithm , evolutionary biology , biology
Linear response theory in quantum theory with its linear response function and its quantization process has been formulated. The relation between the linear response function with its generalized susceptibility, its symmetry properties, and its analyticity has been studied. These properties produce the dispersion relation or Kramers-Kronig relation. The explicit form of the quantum response function and generalized susceptibility also been reviewed. Applications of linear response functions have been described for three elementary processes. The process discussed is the magnetic field disturbance in the magnetic system that generates magnetic susceptibility, and the electric field disturbance in the electrical system that generates electrical conductivity tensor and the ferromagnet Heisenberg that generates its generalized susceptibility.