| Autor: |
Tong Zhou, Xie-Gang Zhu, Mingyu Tong, Yun Zhang, Xue-Bing Luo, Xiangnan Xie, Wei Feng, Qiuyun Chen, Shiyong Tan, Zhen-Yu Wang, Tian Jiang, Yuhua Tang, Xin-Chun Lai, Xuejun Yang |
| Předmět: |
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| Zdroj: |
Chinese Physics Letters; Nov2019, Vol. 36 Issue 11, p1-1, 1p |
| Abstrakt: |
Nodal line semimetal (NLS) is a new quantum state hosting one-dimensional closed loops formed by the crossing of two bands. The so-called type-II NLS means that these two crossing bands have the same sign in their slopes along the radial direction of the loop, which requires that the crossing bands are either right-tilted or left-tilted at the same time. According to the theoretical prediction, Mg3Bi2 is an ideal candidate for studying the type-II NLS by tuning its spin-orbit coupling (SOC). High-quality Mg3Bi2 films are grown by molecular beam epitaxy (MBE). By in-situ angle resolved photoemission spectroscopy (ARPES), a pair of surface resonance bands around the point are clearly seen. This shows that Mg3Bi2 films grown by MBE are Mg(1)-terminated by comparing the ARPES spectra with the first principles calculations results. Moreover, the temperature dependent weak anti-localization effect in Mg3Bi2 films is observed under magneto-transport measurements, which shows clear two-dimensional (2D) e–e scattering characteristics by fitting with the Hikami–Larkin–Nagaoka model. Therefore, by combining with ARPES, magneto-transport measurements and the first principles calculations, this work proves that Mg3Bi2 is a semimetal with topological surface states. This paves the way for Mg3Bi2 to be used as an ideal material platform to study the exotic features of type-II nodal line semimetals and the topological phase transition by tuning its SOC. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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