Large Tunable Rashba Spin Splitting of a Two-Dimensional Electron Gas inBi2Se3

Abstract

We report a Rashba spin splitting of a two-dimensional electron gas in the topological insulator Bi(2)Se(3) from angle-resolved photoemission spectroscopy. We further demonstrate its electrostatic control, and show that spin splittings can be achieved which are at least an order-of-magnitude larger than in other semiconductors. Together these results show promise for the miniaturization of spintronic devices to the nanoscale and their operation at room temperature.

Momentum-resolved STM studies of Rashba-split surface states on the topological semimetal Sb

“…This change in dispersion signifies the turnover of the outer Rashba cone, and represents the crossover to the Dirac regime of the topological surface state band structure. Such a crossover is in contrast to QPI modes arising from prototypical Rashbasplit states in conventional materials [56], also known to exist on TIs [20,21,57].…”

Quantum oscillations of the topological surface states in low carrier concentration crystals of Bi2−xSbxTe3Pan1, Никитин2, Wu3 et al. 2016Solid State Communications7100View full textAdd to dashboardCite

“…In order to fit the energy dispersion of the topological surface state as accurately as possible we need to maximize the number of data points in the occupied part of the energy spectrum. In this sense, the time-dependent energy shift to lower energies observed in BSTS [35,36] and other Bi-based TIs [37,38] is beneficial. We therefore chose to fit data acquired on a sample which has been maintained for 8 h in a background pressure in the mid 10 −11 mbar range.…”

Transport properties of topological insulators: Band bending, bulk metal-to-insulator transition, and weak anti-localization

“…This shift has been found in some samples to be upward giving rise to a depletion of carriers near the interface [24][25] [30], while in other samples it has been found to shift downward, which gives rise to an accumulation region near the surface [27,31]. This downward bending also gives rise to a non-topological two dimensional electron gas (2DEG) because the downward bending creates a quantum well that quantizes the bulk bands near the surface [31][32][33][34][35][36][37].…”