Thermodynamics and Optical Conductivity of a Dissipative Carrier in a Tight Binding Model

概要

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Therrnodynattaics and tr;rnsport projcerties of' 21 dissipative particle in a tight-binding uaaodelare sttrdied throtrgh specific heat and optical condtrctivity. A xve;tk coupling tlneory is constittrtedto sttrdy tlte crossoxver Icehavior loetxveen the loxv-tetaaperattrre region and the laigJa-tetnperatureregion analytically. XX"e f'otrzad tJaat coherent patrt ?rrotund zero freqtzency in the optical cotudtrctivity disappears f'or O< s< 2, xvhere s is 2111 exponent of' a spectr?t1 ['unctiota of the environttaent.Detailed calctzlation is perfortaaed for ohraaic d;ttaaping (8 : l). In this case, the specific he?rtshoxvs an LlI1LlSLl21l ']-line;tr behaxzior at low ternperattrres. which indicates that the environraaentstrongly inflttences the particle taaotion, ?xtad changes the lox'x'-energy states of' tlae dissipative par-ticle. The optical condtrctivit3' crew) takes 21 non-Drtrde f'orrta even at zero tetauperattrre, and the2Kltigh-freqtrency side behaves ;ts w ', xvhere K is a dintaensionless darnjcing strength. The highfreqtrency side of the optical condtrctixzity' is independetat of tettaperattzres, xvhile the IOXV ['re-qtrency side depeuads on Late tettaper?tttzre, sand beh,.rxxes as T" ' ;xt high tenaperattrres. XX'e alsocoraartaent on tlae ajcjolicatt.ion of this ataodel to tlae description of' incoherent rnotion in correlatedelectron systetns.
社団法人日本物理学会の論文
1998-08-15