Collective vs. single-particle motion in quantum many-body systems: Spreading and its semiclassical interpretation in the perturbative regime

被引：5

作者：

Haemmerling, J. ^{[1
]}

Gutkin, B. ^{[1
]}

Guhr, T. ^{[1
]}

机构：

[1] Univ Duisburg Essen, Fak Phys, D-47048 Duisburg, Germany

来源：

EPL | 2011年 / 96卷 / 02期

关键词：

SCISSORS MODE; NUCLEI;

D O I：

10.1209/0295-5075/96/20007

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the interplay between collective and incoherent single-particle motion in a model of two chains of particles whose interaction comprises a non-integrable part. In the perturbative regime, but for a general form of the interaction, we calculate the spectral density for collective excitations. We obtain the remarkable result that it always has a unique semiclassical interpretation. We show this by a proper renormalization procedure which allows us to map our system to a Caldeira-Leggett type model in which the bath is part of the system. Copyright (C) EPLA, 2011

引用

页数：5

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