Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors

Abstract

We investigate the two-dimensional (2D) highly spin-polarized electron accumulation layers commonly appearing near the surface of n-type polar semiconductors BiTeX (X = I, Br, and Cl) by angular-resolved photoemission spectroscopy. Due to the polarity and the strong spin-orbit interaction built in the bulk atomic configurations, the quantized conduction-band subbands show giant Rashba-type spin-splitting. The characteristic 2D confinement effect is clearly observed also in the valence-bands down to the binding energy of 4 eV. The X-dependent Rashba spin-orbit coupling is directly estimated from the observed spin-split subbands, which roughly scales with the inverse of the band-gap size in BiTeX.

15 pages 4 figures

References in corpus (1)

• Emergent quantum confinement at topological insulator surfaces

Cited by in corpus (19)

• Rashba-Dresselhaus spin-splitting in the bulk ferroelectric oxide BiAlO${}_3$
• Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems
• Exploring Topological Superconductivity in Topological Materials
• RKKY interaction in three-dimensional electron gases with linear spin-orbit coupling
• Optical properties of BiTeBr and BiTeCl
• Pressure-induced topological phase transition in polar semiconductor BiTeBr
• Two-dimensional Square Buckled Rashba Lead Chalcogenides
• Spin-orbit scattering visualized in quasiparticle interference
• Temperature dependence of the bulk Rashba splitting in the bismuth tellurohalides
• The momentum and photon energy dependence of the circular dichroic photoemission in the bulk Rashba semiconductors BiTeX (X = I, Br, Cl)
• Pressure effects on crystal and electronic structure of bismuth tellurohalides
• Ab initio electronic structure and optical conductivity of bismuth tellurohalides
• Imaging ambipolar two-dimensional carriers induced by the spontaneous electric polarization of a polar semiconductor BiTeI
• 2D and 3D topological phases in BiTe$X$ compounds
• Spin-helical Dirac states in graphene induced by polar-substrate surfaces with giant spin-orbit interaction: a new platform for spintronics
• BiTeCl and BiTeBr: a comparative high-pressure optical study
• Thermoelectric and optical probes for a Fermi surface topology change in noncentrosymmetric metals
• Spin Filtering via Resonant Reflection of Relativistic Surface States
• Scanning tunneling microscopy study of the possible topological surface states in BiTeCl