Bulk Rashba spin splitting and Dirac surface state in $p$-type (Bi${}_{0.9}$Sb${}_{0.1}{)}_2$Se${}_3$ single crystal

Abstract

We report bulk Rashba spin splitting (RSS) and associated Dirac surface state in (Bi${}_{0.9}$Sb${}_{0.1}{)}_2$Se${}_3$, exhibiting dominant $p$-type conductivity. We argue from the synchrotron diffraction studies that origin of the bulk RSS is due to a structural transition to a non-centrosymmetric $R3m$ phase below $\sim$ 30 K. The Shubnikov-de Haas Van (SdH) oscillations observed in the magnetoresistance curves at low temperature and the Landau level fan diagram, as obtained from these oscillations, confirm the presence of nontrivial Dirac surface state. The magnetization data at low temperature exhibit substantial orbital magnetization consistent with the bulk RSS. The existance of both the bulk RSS and Dirac surface states are confirmed by first principles density functional theory calculations. Coexistence of orbital magnetism, bulk RSS, and Dirac surface state is unique for $p$-type (Bi${}_{0.9}$Sb${}_{0.1}{)}_2$Se${}_3$, making it an ideal candidate for spintronic applications.

References in corpus (26)

• Berry Phase Effects on Electronic Properties
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• WannierTools: An open-source software package for novel topological materials
• New Perspectives for Rashba Spin-Orbit Coupling
• Topological Insulator Materials
• p-type Bi2Se3 for topological insulator and low temperature thermoelectric applications
• Two-dimensional Dirac fermions in a topological insulator: transport in the quantum limit
• Topological origin of subgap conductance in insulating bilayer graphene
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• Large tuneable Rashba spin splitting of a two-dimensional electron gas in Bi2Se3
• Rashba spin-splitting control at the surface of the topological insulator Bi2Se3
• Angular-dependent oscillations of the magnetoresistance in Bi_2Se_3 due to the three-dimensional bulk Fermi surface
• Higher-order contributions to the Rashba-Bychkov effect with application to Bi/Ag(111) surface alloy
• Reversible spin texture in ferroelectric HfO2
• Shubnikov-de Haas oscillations near the metal-insulator transition in a two-dimensional electron system in silicon
• Probing the Fermi Surface of 3D Dirac Semimetal Cd${}_3$As${}_2$ through de Haas-van Alphen Technique
• Mechanisms of enhanced orbital dia- and paramagnetism: Application to the Rashba semiconductor BiTeI
• Engineering Chiral and Topological Orbital Magnetism of Domain Walls and Skyrmions
• Robust gapless surface state and Rashba-splitting bands upon surface deposition of magnetic Cr on Bi${}_2$Se${}_3$
• Observation of three-dimensional Dirac semimetal state in topological insulator Bi2Se3
• Quantum oscillations in metallic Sb2Te2Se topological insulator
• Quantum transport in topological surface states of Bi${}_2$Te${}_3$ nanoribbons
• Simultaneous detection of quantum oscillations from bulk and topological surface states in metallic Bi2Se2.1Te0.9
• Thermoelectric and optical probes for a Fermi surface topology change in noncentrosymmetric metals
• Structural Phase Transition and Carrier Density Tuning in SnSexTe1-x Nanoplates for Topological Crystalline Insulators
• Thermoelectric probe for Rashba spin-orbit interaction strength in a two dimensional electron gas