arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/0003049quant-ph
收藏

耗散介质中的Berry相

Berry's Phase in the Presence of a Dissipative Medium

K. M. Fonseca Romero, A. C. Aguiar Pinto, M. T. Thomaz

摘要:

本文考虑自旋为1/2的耦合到慢变磁场中的模型,其中存在由Lindblad型算符表示的弱阻尼。我们表明,贝里的几何相位保持不变的两个耗散机制考虑。耗散效应是双重的:布洛赫矢量的模的收缩,其表征相干损失和时间依赖性(耗散相关)进动角。我们表明,线加宽的傅立叶变换的磁化分量是由于耗散的存在。

英文摘要:

We consider the spin 1/2 model coupled to a slowly varying magnetic field in the presence of a weak damping represented by a Lindblad-form operators. We show that Berry's geometrical phase remains unaltered by the two dissipation mechanism considered. Dissipation effects are twofold: a shrinking in the modulus of the Bloch's vector, which characterizes coherence loss and a time dependent (dissipation related) precession angle. We show that the line broadening of the Fourier transformation of the components of magnetization is only due to the presence of dissipation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑