Inversion symmetry breaking induced triply degenerate points in orderly arranged PtSeTe family materials

Xiao, R. C.1,2; Cheung, C. H.3; Gong, P. L.4; Lu, W. J.1; Si, J. G.1,2; Sun, Y. P.1,5,6

2018-06-20

10.1088/1361-648X/aac298

JOURNAL OF PHYSICS-CONDENSED MATTER   影响因子和分区

0953-8984

1361-648X

k paths exactly with C(3v )symmetry allow to find triply degenerate points (TDPs) in band structures. The paths that host the type-II Dirac points in PtSe2 family materials also have the C-3v spatial symmetry. However, due to Kramers degeneracy (the systems have both inversion symmetry and time reversal symmetry), the crossing points in them are Dirac ones. In this work, based on symmetry analysis, first-principles calculations, and k . p method, we predict that PtSe2 family materials should undergo topological transitions if the inversion symmetry is broken, i.e. the Dirac fermions in PtSe2 family materials split into TDPs in PtSeTe family materials (PtSSe, PtSeTe, and PdSeTe) with orderly arranged S/Se (Se/Te). It is different from the case in high-energy physics that breaking inversion symmetry / leads to the splitting of Dirac fermion into Weyl fermions. We also address a possible method to achieve the orderly arranged in PtSeTe family materials in experiments. Our study provides a real example that Dirac points transform into TDPs, and is helpful to investigate the topological transition between Dirac fermions and TDP fermions.

topological semimetal triply degenerate point Dirac fermion

SCI ; EI

英语

其他

National Nature Science Foundation of China[11674326] ; National Nature Science Foundation of China[11774351] ; National Nature Science Foundation of China[11704001] ; National Nature Science Foundation of China[U1232139]

Physics

Physics, Condensed Matter

WOS:000432959300001

IOP PUBLISHING LTD

20182405295157

Calculations ; High energy physics ; Palladium compounds ; Platinum compounds ; Tellurium compounds ; Topology

Mathematics:921 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; High Energy Physics:932.1

PHYSICS

Web of Science

1.Chinese Acad Sci, Key Lab Mat Phys, Inst Solid State Phys, Hefei 230031, Anhui, Peoples R China
2.Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
3.Natl Taiwan Univ, Grad Inst Appl Phys, Taipei 10617, Taiwan
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
5.Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Anhui, Peoples R China
6.Nanjing Univ, Collaborat Innovat Ctr Microstruct, Nanjing 210093, Jiangsu, Peoples R China

Xiao, R. C.,Cheung, C. H.,Gong, P. L.,et al. Inversion symmetry breaking induced triply degenerate points in orderly arranged PtSeTe family materials[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2018,30(24).

Xiao, R. C.,Cheung, C. H.,Gong, P. L.,Lu, W. J.,Si, J. G.,&Sun, Y. P..(2018).Inversion symmetry breaking induced triply degenerate points in orderly arranged PtSeTe family materials.JOURNAL OF PHYSICS-CONDENSED MATTER,30(24).

Xiao, R. C.,et al."Inversion symmetry breaking induced triply degenerate points in orderly arranged PtSeTe family materials".JOURNAL OF PHYSICS-CONDENSED MATTER 30.24(2018).