Detecting the Néel vector of altermagnet by attaching a topological insulator and crystalline valley-edge insulator
arxiv(2024)
摘要
In order to detect the Néel vector of an altermagnet, we investigate
topological phases in a bilayer system composed of an altermagnet and a
two-dimensional topological insulator described by the Bernevig-Hughes-Zhang
model. A topological phase transition occurs from a first-order topological
insulator to a trivial insulator at a certain critical altermagnetization if
the Néel vector of altermagnet is along the x axis or the y axis. It is
intriguing that valley-protected edge states emerge along the Néel vector
in this trivial insulator, which are as stable as the topological edge states.
We name it a crystalline valley-edge insulator. On the other hand, the system
turns out to be a second-order topological insulator when the Néel vector
is along the z axis. The tunneling conductance has a strong dependence on the
Néel vector. In addition, the band gap depends on the Néel vector,
which is measurable by optical absorption. Hence, it is possible experimentally
to detect the Néel vector by measuring tunneling conductance and optical
absorption.
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