Electronic properties of phases in the quasi-binary Bi[sub]2Se[sub]3-Bi[sub]2S[sub]3 systemZipporah Rini Benher
, Sandra Gardonio
, Mattia Fanetti
, Paolo Moras
, Asish K. Kundu
, Chiara Bigi
, Matjaž Valant
, 2021, original scientific article
Abstract: We explored the properties of the quasi-binary Bi2Se3–Bi2S3 system over a wide compositional range. X-ray diffraction analysis demonstrates that rhombohedral crystals can be synthesized within the solid solution interval 0–22 mol% Bi2S3, while at 33 mol% Bi2S3 only orthorhombic crystals are obtained. Core level photoemission spectroscopy reveals the presence of Bi3+, Se2− and S2− species and the absence of metallic species, thus indicating that S incorporation into Bi2Se3 proceeds prevalently through the substitution of Se with S. Spin- and angle-resolved photoemission spectroscopy shows that topological surface states develop on the surfaces of the Bi2Se3−ySy (y ≤0.66) rhombohedral crystals, in close analogy with the prototypical case of Bi2Se3, while the orthorhombic crystals with higher S content turn out to be trivial semiconductors. Our results connect unambiguously the phase diagram and electronic properties of the Bi2Se3–Bi2S3 system.
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Summary of found: ...We explored the properties of the quasi-binary Bi2Se3–Bi2S3 system over a wide compositional range. X-ray...
Keywords: topological insulator, quasi-binary Bi2Se3-Bi2S3 system, electronic properties
Published: 29.03.2021; Views: 99; Downloads: 0
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