计算物理 ›› 2019, Vol. 36 ›› Issue (1): 113-126.DOI: 10.19596/j.cnki.1001-246x.7773

• • 上一篇    

求解带有锥形交叉区域薛定谔方程的改进界面跃迁格式

李新春   

  1. 上海交通大学数学科学学院, 上海 200240
  • 收稿日期:2017-09-26 修回日期:2017-11-05 出版日期:2019-01-25 发布日期:2019-01-25
  • 作者简介:李新春(1988-),男,汉族,山东,博士生,研究方向为计算数学,E-mail:neo.lee@sjtu.edu.cn
  • 基金资助:
    国家自然科学基金(91330203)资助项目

A Modified Surface Hopping Method for Schrödinger Equation with Conical Crossings

LI Xinchun   

  1. School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2017-09-26 Revised:2017-11-05 Online:2019-01-25 Published:2019-01-25

摘要: 改进一种欧拉框架下的界面跃迁格式.原格式是为求解带有多个能级,不同能级之间存在锥形交叉区域的薛定谔方程提出的.石墨烯中的电子输运与上述过程相似.Kammerer等人提出带有跳跃算子的数值格式能够更好地保持石墨烯中电子输运的能量守恒.引入这种跳跃算子可以改进原有的界面跃迁格式.改进格式的数值结果取得了预期的效果.

关键词: 薛定谔方程, 刘维尔方程, 界面跃迁格式

Abstract: We present a modified surface hopping method for Schrödinger equation with conical crossings. At the crossing manifold, Landau-Zener formula gives probability that electrons hop to another energy level. Kammerer and Mehats raised a scheme with jump operators ensuring good energy conservation for transport of electrons in a graphene layer which is similar to the physics above. We employ these jump operators to improve a surface hopping method and obtain accurate numerical results.

Key words: Schrödinger equation, Liouville equation, surface hopping method

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