arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1807.01944cond-mat.mtrl-sci
收藏

从回旋有效质量、电子迁移率和Shubnikov-de Haas振荡相移研究体HgSe的非平凡拓扑

Nontrivial topology of bulk HgSe from the study of cyclotron effective mass, electron mobility and phase shift of Shubnikov-de Haas oscillations

S. B. Bobin, A. T. Lonchakov, V. V. Deryushkin, V. N. Neverov

摘要:

本文作者报道了在硒化汞单晶中,在电子浓度从8.8*10^15 cm^-3扩展到4.3*10^18 cm^-3的范围内,横向磁电阻的舒布尼科夫·德哈斯振荡的有效质量、电子迁移率和相移的实验研究结果。所揭示的功能确认存在的Weyl半金属相在硒汞在低电子密度,这已表明由以前的磁输运研究。然而,最重要的结果是发现了在电子浓度为2*10^18 cm^-3时Pi的Berry相的突变,我们用HgSe中拓扑Lifshitz跃迁的表现来解释,这种跃迁是通过掺杂来调节费米能而发生的。

英文摘要:

In this paper, the authors report the results of an experimental study of effective mass, electron mobility and phase shift of Shubnikov de Haas oscillations of transverse magnetoresistance in an extended electron concentration region from 8.8*10^15 cm^-3 to 4.3*10^18 cm^-3 in single crystals of mercury selenide. The revealed features confirm the existence of a Weyl semimetal phase in HgSe at low electron density, which has been indicated by previous magnetotransport studies. However, the most significant result is the discovery of an abrupt change of Berry phase of Pi at electron concentration 2*10^18 cm^-3, which we explain in terms of a manifestation of topological Lifshitz transition in HgSe that occurs by tuning Fermi energy via doping.

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。

↑