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

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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.

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

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Publication details

The article was received on 26 Aug 2018, accepted on 22 Oct 2018 and first published on 22 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05426F
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Huge Rashba-type spin–orbit coupling in binary hexagonal PX nanosheets (X = As, Sb, and Bi)

    L. Zhu, T. Zhang, G. Chen and H. Chen, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP05426F

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