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 ${\mathrm{Bi}}_2{\mathrm{Se}}_3$ 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.