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Journal of Physical Studies 9(4), 349–357 (2005)
DOI: https://doi.org/10.30970/jps.09.349 DYNAMICS OF CHARGE TRANSFER IN QUASI-ONE-DIMENSIONAL HYDROGEN-BONDED STRUCTURESI. V. Stasyuk1, R. Ya. Stetsiv1, R. Ya. Yurechko2
1Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine, |
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The model for the description of the charge transfer in quasi-one-dimensional hydrogen-bonded structures is proposed. The model includes the proton-electron interaction that indicates the charge changes of the ions forming the hydrogen bond, which are caused by proton shifts on the bond, and the cooperative proton-electron transfer. The band electron spectrum is calculated in the mean field approximation (MFA). The mean number of electrons on site depending on the value of the chemical potential $μ$ is obtained. The proton tunnelling frequency, renormalized by the interaction of the proton with the mean field of the electron subsystem is calculated. It is established that the hydrogen-bonded system can be found in three regimes with different width of electron band and essentially different values of the effective proton tunnelling frequency $ Ω^{\rm eff}$. The frequency dependence of the real part of conductivity is obtained. The possibility of the phase transitions like the transformation between uniform phases with different electron concentration $n$ is established depending on the value of the chemical potential $μ$. The separation of the system into the phases with different width of the electron band, different $n$ and $ Ω^{\rm eff}$ as well as different electron conductivity at the given average electron concentration is obtained.
PACS number(s): 72.60.+g; 36.40.-c