Effects of periodic modulation on the Landau-Zener transition

被引：15

作者：

Duan, SQ ^{[1
]}

Fu, LB ^{[1
]}

Liu, J ^{[1
]}

Zhao, XG ^{[1
]}

机构：

[1] Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China

来源：

PHYSICS LETTERS A | 2005年 / 346卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Landau-Zener tunnelling; periodic modulation; analytic solution;

D O I：

10.1016/j.physleta.2005.07.086

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the quantum tunnelling of a two-level crossing system which extends the standard Landau-Zener model with applying a periodic modulation on its energy sweep. By directly integrating the time evolution operator we obtain the analytic expressions of tunnelling probability in the cases of high and low modulation frequency limit as well as in weak inter-level coupling limit. Our formula clarify the conditions for resonance occurrence, with the help of it we can readily manipulate the system in a desired way, say, to enhance or suppress the tunnelling probability effectively through adjusting the modulation properly. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：315 / 320

页数：6

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