Huge Rashba-type spin–orbit coupling in binary hexagonal PX nanosheets (X = As, Sb, and Bi)

Literature Information

Publication Date 2018-10-22
DOI 10.1039/C8CP05426F
Impact Factor 3.676
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Abstract

We theoretically propose that Rashba-type band splitting can be achieved in binary alloyed hexagonal PX nanosheets (X = As, Sb, and Bi). The lack of inversion symmetry results in an effective electric field perpendicular to the basal plane of PX, hence, leading to Rashba-type spin–orbit coupling (SOC) in the two dimensional PX nanosheets. Since the SOC strength roughly scales quadratically with atomic number, the largest band splitting is found in PBi with a Rashba coefficient of ∼1.56 eV Å, which is a huge value among two-dimensional materials. Furthermore, tensile biaxial strain can be employed to significantly enhance the strength of SOC, for instance, a Rashba coefficient of 4.41 eV Å can be realized at a strain of 10%. The huge and strain-tunable Rashba-type SOC of PBi suggests that it holds great promise for spintronic applications.

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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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