Valley-dependent Multiple Quantum States and Topological Transitions in Germanene-based Ferromagnetic van der Waals Heterostructures
arxiv(2024)
摘要
Topological and valleytronic materials are promising for spintronic and
quantum applications due to their unique properties. Using first principles
calculations, we demonstrate that germanene (Ge)-based ferromagnetic
heterostructures can exhibit multiple quantum states such as quantum anomalous
Hall effect (QAHE) with Chern numbers of C=-1 or C=-2, quantum valley Hall
effect (QVHE) with a valley Chern number of Cv=2, valley-polarized quantum
anomalous Hall effect (VP-QAHE) with two Chern numbers of C=-1 and Cv=-1 as
well as time-reversal symmetry broken quantum spin Hall effect (T-broken QSHE)
with a spin Chern number of Cs 1. Furthermore, we find that the transitions
between different quantum states can occur by changing the magnetic orientation
of ferromagnetic layers through applying a magnetic field. Our discovery
provides new routes and novel material platforms with a unique combination of
diverse properties that make it well suitable for applications in electronics,
spintronics and valley electronics.
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