Dynamical conductivity of lithium-intercalated hexagonal boron nitride films : A memory function approach
- Rukelj, Zoran Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland - Department of Physics, Faculty of Science, University of Zagreb, Bijeniˇcka c. 32, 10000 Zagreb, Croatia
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09.11.2020
Published in:
- Physical Review B. - 2020, vol. 102, no. 20, p. 205108
English
This work is a study of dynamical conductivity of a quasi-two-dimensional heterostructure Li(BN)8. The conducting electrons have a free-electron-like parabolic dispersion and are assumed to scatter only on acoustic phonons. The approach used to derive the generalized Drude relation with frequency and temperature dependent relaxation consists of defining the induced current density as a function of the electron-hole operator. This element is proportional to the perturbating electric field and is decomposed into the zeroth and second order of the electron-phonon interaction. The electron-hole operator is then evaluated using the Heisenberg equation. The connection between the electron-hole operator and the memory function is shown. The analytical properties of the imaginary and real part of the frequency and temperature dependent memory function, that describe electron scattering on acoustic and optical phonons, are examined in detail. Finally, the dynamical conductivity of Li(BN)8 is calculated, with the explanation of all relevant features originating from the memory function.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 329796
- DOI 10.1103/PhysRevB.102.205108
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308912
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