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Coexistence of Weyl and Type‐II Triply Degenerate Fermions in a Ternary Topological Semimetal YPtP
Author(s) -
Tan Rui,
Li Zehou,
Zhou Pan,
Ma Zengsheng,
Tan Chaogui,
Sun Lizhong
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900421
Subject(s) - fermion , degenerate energy levels , ternary operation , physics , topology (electrical circuits) , weyl semimetal , semimetal , type (biology) , fermi gamma ray space telescope , coupling (piping) , condensed matter physics , band gap , quantum mechanics , materials science , mathematics , geology , combinatorics , computer science , paleontology , metallurgy , programming language
Based on first‐principles calculations and effective model analysis, the long‐ago synthesized material YPtP is identified as a topological semimetal (TSM) material for studying the interaction between Weyl and triply degenerate fermions. When the spin–orbit coupling (SOC) is ignored, a triply degenerate point (TDP) and two types of ring‐shaped gapless nodal lines coexist in YPtP. When SOC is considered, the TDP turns to two type‐II TDPs, and the nodal lines open the bandgap and one of them transforms into 12 pairs of Weyl points. Thus, YPtP is a ternary TSM with the coexistence of type‐II TDPs and Weyl points. The surface states and Fermi arcs in YPtP further verify the topological characteristics of YPtP. The results herein provide a new platform for exploring ternary topological materials and the interaction between the two different fermions.