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Acta Physica Sinica

LOCALIZATION-DISLOCALIZATION TRANSITION IN DISSIP-ATIVE QUANTUM TUNNELING SYSTEMS

Y Hang

Published Jan 1, 1989• 0 citations
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Abstract

Based on the renormalization effect of the phonon ground state on the tunneling parameters, a new method is proposed to investigate the localization-dislocalization transition of a tunneling system with bosonic bath. Our study shows the previous theories are in principle built on the displaced phonon state approximation, while our method may be used to examine the effects of other type of phonon ground states (such as squeezed phonon state) on the localization-dislocalization transition.

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Based on the renormalization effect of the phonon ground state on the tunneling parameters, a new method is proposed to investigate the localization-dislocalization transition of a tunneling system with bosonic bath. Our study shows the previous theories are in principle built on the displaced phonon state approximation, while our method may be used to examine the effects of other type of phonon ground states (such as squeezed phonon state) on the localization-dislocalization transition.
摘要 本文用变分法研究了耗散量子系统中的声于基态及其对局域一退局域相变条件的影响.发现: 1. 声子基态不仅存在通常的位移效应, 而且还有形变效应. 本文提出的位移一压缩态可同时描述这两种效应; 2. 声子基态的选择对相变条件有很大影响.随着声子基态能量下降,相变曲线将向强祸合方向移动. Abstract The ground states of phonons in dissipative quantum tunneling system and their influences on the localization delocalization transition are investigated by a variational approach. We find that: 1.There are two kind of influences, displacement and deformation, on phonon describe both these influences. 2. The localization-delocalization transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases. 作者及机构信息 石云龙；陈鸿；吴翔 1. 雁北师范学院物理系；同济大学物理系 Authors and contacts Shi Yun-long Chen hong Wu Xiang 参考文献 施引文献
The ground states of phonons in a dissipative quantum tunneling system and their influences on the localiza ion-delocalization transtion are investigated by a variational approach. We find that: 1. There are two kind of influences, displacement and deformation, on phonon states due to coupling with a tunneling particle, and displaced -squeezed states are proposed to describe both these influences. 2. The localization-delocahzation transition depends on the choice of phonon ground state. The transition will occur at strong coupling as the energy of the ground state decreases.