TY  - JOUR
AU  - Niu, Chengwang
AU  - Buhl, Patrick
AU  - Bihlmayer, Gustav
AU  - Wortmann, Daniel
AU  - Dai, Ying
AU  - Blügel, Stefan
AU  - Mokrousov, Yuriy
TI  - Two-dimensional topological nodal line semimetal in layered X 2 Y ( X = Ca , Sr, and Ba; Y = As , Sb, and Bi)
JO  - Physical review / B
VL  - 95
IS  - 23
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-06568
SP  - 235138
PY  - 2017
AB  - In topological semimetals the Dirac points can form zero-dimensional and one-dimensional manifolds, as predicted for Dirac/Weyl semimetals and topological nodal line semimetals, respectively. Here, based on first-principles calculations, we predict a topological nodal line semimetal phase in the two-dimensional compounds X2Y (X = Ca, Sr, and Ba; Y = As, Sb, and Bi) in the absence of spin-orbit coupling (SOC) with a band inversion at the M point. A nontrivial Z2 invariant of Z2=1 remains although a tiny gap appears at the nodal line when SOC is included. The mirror symmetry as well as the electrostatic interaction, which can be engineered via strain, are responsible for the nontrivial phase. In addition, the nontrivial phase is further explicitly confirmed via the existence of exotic edge states without and with SOC.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000404018100001
DO  - DOI:10.1103/PhysRevB.95.235138
UR  - https://juser.fz-juelich.de/record/837708
ER  -