Stanene on a SiC(0001) surface: a candidate for realizing quantum anomalous Hall effect

Literature Information

Publication Date 2019-04-30
DOI 10.1039/C9CP01509D
Impact Factor 3.676
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Abstract

Stanene, a cousin of graphene, has pz-orbital Dirac states, owing to its hexagonal symmetry. Nevertheless, stanene has to be obtained through growing on substrates with strong interfacial interactions, which generally damages their intrinsic π(pz)-orbital Dirac states. Fortunately, we find that the quadratic topological states are derived from the px,y orbitals rather than pz orbitals in stanene on 4H-SiC(0001), which survive even the strong interfacial interactions. We also find that the spin-orbital coupling simultaneously with the exchange field gives rise to an observable band gap of 22.97 meV. Berry curvature and edge state calculations further demonstrate the nontrivial topological phase of such quadratic topological states with a Chern number C = 2, showing its potential to realize quantum anomalous Hall effect at near room temperature. Finally, we construct a simple effective model to reveal the low-energy physics in this system. It is hoped this finding will be applicable to other two-dimensional materials, which should be useful for future investigations.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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