Direct Observation of Interband Spin-Orbit Coupling in a Two-Dimensional Electron System

Abstract

We report the direct observation of interband spin-orbit (SO) coupling in a two-dimensional (2D) surface electron system, in addition to the anticipated Rashba spin splitting. Using angle-resolved photoemission experiments and first-principles calculations on Bi/Ag/Au heterostructures we show that the effect strongly modifies the dispersion as well as the orbital and spin character of the 2D electronic states, thus giving rise to considerable deviations from the Rashba model. The strength of the interband SO coupling is tuned by the thickness of the thin film structures.

References in corpus (7)

• Topological Insulators with Inversion Symmetry
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• First direct observation of Spin-textures in Topological Insulators : Spin-resolved ARPES as a probe of topological quantum spin Hall effect and Berry's phase
• Spin Polarization and Transport of Surface States in the Topological Insulators Bi2Se3 and Bi2Te3 from First Principles
• Large tuneable Rashba spin splitting of a two-dimensional electron gas in Bi2Se3
• Intersubband-induced spin-orbit interaction in quantum wells
• Tunable spin-gaps in a quantum-confined geometry

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• Direct Mapping of Spin and Orbital Entangled Wavefunction under Interband Spin-Orbit coupling of Rashba Spin-Split Surface States
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• A generic model with unconventional Rashba bands and giant spin galvanic effect
• Superconductivity in Two-Dimensional Systems with Unconventional Rashba Bands
• Electric field induced second-order anomalous Hall transport in unconventional Rashba systems
• Charge-Spin Conversion in Two-Subband Quantum Wells with Conventional and Unconventional Rashba Spin-Orbit Coupling
• Spin-orbit density wave: A new phase of matter applicable to the hidden order state of URu2Si2
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• Beyond spin-1/2: Multipolar spin-orbit coupling in noncentrosymmetric crystals with time-reversal symmetry
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