Nonlinear effects in E circle times (b(1)+b(2)) Jahn-Teller model: variational approach with excited phonon states and mode correlations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F03%3A00001580" target="_blank" >RIV/61989592:15310/03:00001580 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Nonlinear effects in E circle times (b(1)+b(2)) Jahn-Teller model: variational approach with excited phonon states and mode correlations

Popis výsledku v původním jazyce

Interplay of nonlinear and quantum effects in the ground state of the E circle times (b(1)+b(2)) Jahn-Teller model was investigated by the variational approach and exact numerical simulations. They result in the recognition of (i) the importance of the admixture of the first excited state of the displaced harmonic oscillator of the symmetric phonon mode in the ground state of the system in the self-trapping-dominated regime, and (ii) the existence of the region of localized b(1)-undisplaced oscillator states in the tunnelling-dominated regime. Effect (i) occurs owing to a significant decrease in the ground state energy on account of the overlapping contribution of the symmetric phonon mode between states of the same parity. This contribution considerably improves variational results, especially in the self-trapping-dominated regime. Close to the E circle times e limit, the nonlinear effects of two-mode correlations turn out to be effective due to the rotational symmetry of this case. I

Název v anglickém jazyce

Nonlinear effects in E circle times (b(1)+b(2)) Jahn-Teller model: variational approach with excited phonon states and mode correlations

Popis výsledku anglicky

Interplay of nonlinear and quantum effects in the ground state of the E circle times (b(1)+b(2)) Jahn-Teller model was investigated by the variational approach and exact numerical simulations. They result in the recognition of (i) the importance of the admixture of the first excited state of the displaced harmonic oscillator of the symmetric phonon mode in the ground state of the system in the self-trapping-dominated regime, and (ii) the existence of the region of localized b(1)-undisplaced oscillator states in the tunnelling-dominated regime. Effect (i) occurs owing to a significant decrease in the ground state energy on account of the overlapping contribution of the symmetric phonon mode between states of the same parity. This contribution considerably improves variational results, especially in the self-trapping-dominated regime. Close to the E circle times e limit, the nonlinear effects of two-mode correlations turn out to be effective due to the rotational symmetry of this case. I

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BE - Teoretická fyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GA202%2F01%2F1450" target="_blank" >GA202/01/1450: Kvantové fluktuace v nelineárních mřížkových elektron-fononových modelech v jedné dimenzi</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2003

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physics - Condensed Matter

ISSN

0953-8984

e-ISSN

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Svazek periodika

15

Číslo periodika v rámci svazku

13

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

2137-2153

Kód UT WoS článku

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EID výsledku v databázi Scopus

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