Abstract
We study theoretically the core absorption spectrum of an impurity embedded in a tight-binding chain in terms of complex spectral analysis. The absorption spectral profile associated with the resonance states in principle exhibits an asymmetric Fano-type structure, even without apparent multiple interference transition paths. The asymmetric Fano absorption profile is attributed to the complex-valued oscillator strength of the transition to the resonance state belonging to the extended Hilbert space. The boundary condition on the continuum causes a large energy dependence of the self-energy, so that it enhances the nonlinearity of the eigenvalue problem of the effective Hamiltonian, yielding several non-analytic resonance states. The optical transitions to these resonance states constitute the overall absorption spectrum structure.
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Acknowledgements
We are very grateful Drs. S. Garmon, K. Noba, and K. Kanki for many valuable discussions. We also thank K. Mizoguchi and Y. Kayanuma for fruitful comments. This work was partially supported by JSPS Grant-in-Aid for Scientific Research No.16H04003, 16K05481, and 17K05585.
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Tanaka, S., Fukuta, T., Petrosky, T. (2018). Study of Fano Resonance in the Core-Level Absorption Spectrum in Terms of Complex Spectral Analysis. In: Kamenetskii, E., Sadreev, A., Miroshnichenko, A. (eds) Fano Resonances in Optics and Microwaves. Springer Series in Optical Sciences, vol 219. Springer, Cham. https://doi.org/10.1007/978-3-319-99731-5_11
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DOI: https://doi.org/10.1007/978-3-319-99731-5_11
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