arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1101.4686cond-mat.mtrl-scicond-mat.mes-hall
收藏

有限电场下的轨道磁电耦合

Orbital magnetoelectric coupling at finite electric field

Andrei Malashevich, David Vanderbilt, Ivo Souza

摘要:

我们将线性轨道磁电耦合的能带理论推广到有限电场下的晶体。以前的工作建立了一个通用的绝缘体在零场的轨道磁电响应包括三个贡献,分别表示为本地环流,巡回环流,和陈-西蒙斯。我们发现,他们中的每一个的表达修改的直流电场的存在。值得注意的是,三个校正项之和为零,因此总耦合仍然由与零场相同的公式给出。紧束缚模型的数值试验证实了这一结论,我们计算了场致线性磁电系数的变化。

英文摘要:

We extend the band theory of linear orbital magnetoelectric coupling to treat crystals under finite electric fields. Previous work established that the orbital magnetoelectric response of a generic insulator at zero field comprises three contributions that were denoted as local circulation, itinerant circulation, and Chern-Simons. We find that the expression for each of them is modified by the presence of a dc electric field. Remarkably, the sum of the three correction terms vanishes, so that the total coupling is still given by the same formula as at zero field. This conclusion is confirmed by numerical tests on a tight-binding model, for which we calculate the field-induced change in the linear magnetoelectric coefficient.

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。

↑