A strongly robust type II Weyl fermion semimetal state in Ta3S2

doi:10.1126/sciadv.1600295

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/117382

請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/117382

題名:	A strongly robust type II Weyl fermion semimetal state in Ta3S2
作者:	Chang, Guoqing;Xu, Su-Yang;Sanchez, Daniel S.;Huang, Shin-Ming;Lee, Chi-Cheng;Chang, Tay-Rong;Bian, Guang;Zheng, Hao;Belopolski, Ilya;Alidoust, Nasser;Jeng, Horng-Tay;Bansil, Arun;Lin, Hsin;Hasan, M. Zahid
關鍵詞:	Weyl fermion;Fermi arc;Topology
日期:	2016-06-03
上傳時間:	2019-10-15 12:10:57 (UTC+8)
摘要:	Weyl semimetals are of great interest because they provide the first realization of the Weyl fermion, exhibit exotic quantum anomalies, and host Fermi arc surface states. The separation between Weyl nodes of opposite chirality gives a measure of the robustness of the Weyl semimetal state. To exploit the novel phenomena that arise from Weyl fermions in applications, it is crucially important to find robust separated Weyl nodes. We propose a methodology to design robust Weyl semimetals with well-separated Weyl nodes. Using this methodology as a guideline, we search among the material parameter space and identify by far the most robust and ideal Weyl semimetal candidate in the single-crystalline compound tantalum sulfide (Ta3S2) with new and novel properties beyond TaAs. Crucially, our results show that Ta3S2 has the largest k-space separation between Weyl nodes among known Weyl semimetal candidates, which is about twice larger than the measured value in TaAs and 20 times larger than the predicted value in WTe2. Moreover, all Weyl nodes in Ta3S2 are of type II. Therefore, Ta3S2 is a type II Weyl semimetal. Furthermore, we predict that increasing the lattice by <4% can annihilate all Weyl nodes, driving a novel topological metal-to-insulator transition from a Weyl semimetal state to a topological insulator state. The robust type II Weyl semimetal state and the topological metal-to-insulator transition in Ta3S2 are potentially useful in device applications. Our methodology can be generally applied to search for new Weyl semimetals.
關聯:	Science Advances 2(6), e1600295
DOI:	10.1126/sciadv.1600295
顯示於類別:	[物理學系暨研究所] 期刊論文

文件中的檔案:

檔案	描述	大小	格式	瀏覽次數
A strongly robust type II Weyl fermion semimetal state in Ta3S2.pdf		2378Kb	Adobe PDF	1	檢視/開啟
index.html		0Kb	HTML	169	檢視/開啟

在機構典藏中所有的資料項目都受到原著作權保護.

TAIR相關文章

資料載入中.....