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Ideal two-dimensional electron systems with a giant Rashba-type spin splitting in real materials: Surfaces of bismuth tellurohalides

AuthorsEremeev, S. V.; Nechaev, I. A.; Koroteev, Yuri M.; Echenique, Pedro M. ; Chulkov, Eugene V.
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review Letters 108: 246802 (2012)
AbstractSpintronics is aimed at actively controlling and manipulating the spin degrees of freedom in semiconductor devices. A promising way to achieve this goal is to make use of the tunable Rashba effect that relies on the spin-orbit interaction in a two-dimensional electron system immersed in an inversion-asymmetric environment. The spin-orbit-induced spin splitting of the two-dimensional electron state provides a basis for many theoretically proposed spintronic devices. However, the lack of semiconductors with large Rashba effect hinders realization of these devices in actual practice. Here we report on a giant Rashba-type spin splitting in two-dimensional electron systems that reside at tellurium-terminated surfaces of bismuth tellurohalides. Among these semiconductors, BiTeCl stands out for its isotropic metallic surface-state band with the Γ̄-point energy lying deep inside the bulk band gap. The giant spin splitting of this band ensures a substantial spin asymmetry of the inelastic mean free path of quasiparticles with different spin orientations. © 2012 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.108.246802
Identifiersdoi: 10.1103/PhysRevLett.108.246802
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(CFM) Artículos
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