Author:
Jeong Jaemo,Kim Dongwook,Kim Youngkuk
Abstract
AbstractWe study topological phase transitions in tetragonal NaZnSb$$_{1-x}$$
1
-
x
Bi$$_x$$
x
, driven by the chemical composition x. Notably, we examine mirror Chern numbers that change without symmetry indicators. First-principles calculations are performed to show that NaZnSb$$_{1-x}$$
1
-
x
Bi$$_x$$
x
experiences consecutive topological phase transitions, diagnosed by the strong $${\mathbb {Z}}_2$$
Z
2
topological index $$\nu _{0}$$
ν
0
and two mirror Chern numbers $$\mu _{x}$$
μ
x
and $$\mu _{xy}$$
μ
xy
. As the chemical composition x increases, the topological invariants ($$\mu _{x}\mu _{xy}\nu _{0}$$
μ
x
μ
xy
ν
0
) change from (000), (020), (220), to (111) at x = 0.15, 0.20, and 0.53, respectively. A simplified low-energy effective model is developed to examine the mirror Chern number changes, highlighting the central role of spectator Dirac fermions in avoiding symmetry indicators. Our findings suggest that NaZnSb$$_{1-x}$$
1
-
x
Bi$$_{x}$$
x
can be an exciting testbed for exploring the interplay between the topology and symmetry.
Funder
the Korean National Research Foundation
the Korea Institute of Science and Technology Information
Publisher
Springer Science and Business Media LLC
Cited by
1 articles.
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