Publication
Title
Ground-state energy of an exciton-(LO)-phonon system in two dimensions
Author
Abstract
This paper presents a variational study of the ground-state energy of an exciton-(LO)-phonon system in two spatial dimensions. it complements a preceding publication. providing a general (D-dimensional) outline and an explicit treatment of the case D = 3. The exciton-phonon interaction is of the Frohlich type. Making use of functional-integral and variational techniques. we obtain upper bounds on the ground-state energy. The present study-like the previous one-has two major intentions: First, we demonstrate or the problem under consideration that one can profitably use a nonharmonic trial action within the functional-integral framework. Second, we show that our lowest bound is an analytical function of the electron-phonon coupling parameter, being completely smooth throughout the whole parameter region, This is in contrast to earlier conjectures, curd excludes phenomena such as self-trapping or self-shrinking, but is consistent with rigorous qualitative results Cor the true ground-state energy. We include a critical comparison of our results with previous ones.
Language
English
Source (journal)
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
Publication
Lancaster, Pa : 1998
ISSN
1098-0121 [print]
1550-235X [online]
Volume/pages
57:3(1998), p. 1814-1819
ISI
000071716800082
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 12.07.2012
Last edited 14.08.2017