SQUEEZED EXCITED-STATES IN EXCITON-PHONON SYSTEMS

被引:20
作者
SONNEK, M
EIERMANN, H
WAGNER, M
机构
[1] Institut für Theoretische Physik, Universität Stuttgart, 70550 Stuttgart
来源
PHYSICAL REVIEW B | 1995年 / 51卷 / 02期
关键词
D O I
10.1103/PhysRevB.51.905
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
In earlier work unusual excited exciton-phonon states have been found for prototype exciton-phonon Hamiltonians (dimer, trimer). These states have been calculated numerically by diagonalizing the respective Fulton-Gouterman equations. Their physical character is such that the motion of the effective exciton becomes free whereas in the vibrational subspace the dynamics is governed by an effective stiffening of the nearest-neighbor interaction. In the present work it is shown analytically by means of a Fröhlich-type transformation, how the stiffening in the phonon dynamics is generated, such that the phononic part for these nonconventional exciton-phonon states is well described by squeezed oscillatory functional forms. © 1995 The American Physical Society.
引用
收藏
页码:905 / 915
页数:11
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