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

Result code in 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>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BE - Theoretical physics

OECD FORD branch

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Project

<a href="/en/project/GA202%2F01%2F1450" target="_blank" >GA202/01/1450: Quantum fluctuations in nonlinear lattice electron-phonon models in one dimension</a><br>

Continuities

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

Publication year

2003

Confidentiality

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

Name of the periodical

Journal of Physics - Condensed Matter

ISSN

0953-8984

e-ISSN

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Volume of the periodical

15

Issue of the periodical within the volume

13

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

2137-2153

UT code for WoS article

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EID of the result in the Scopus database

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