Journal
PHYSICAL REVIEW B
Volume 94, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.94.201403
Keywords
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Funding
- BMBF [05K13UM1, 05K13PA, 05K12EF1, 05K13WMA]
- Deutsche Forschungsgemeinschaft [DFG EL172/18-1, EB154/26-1, SPP1666, FB 917-A3, EB154/32-1]
- Center of Innovative Emerging Materials (CINEMA)
- Stiftung Rheinland-Pfalz fur Innovation [1038]
- CENTEM PLUS [LO1402]
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The breaking of bulk inversion symmetry in ferroelectric semiconductors causes a Rashba-type spin splitting of electronic bulk bands. This is shown by a comprehensive mapping of the spin polarization of the electronic bands in ferroelectric alpha-GeTe(111) films using a time-of-flight momentum microscope equipped with an imaging spin filter that enables a simultaneous measurement of more than 10 000 data points. The experiment reveals an opposite spin helicity of the inner and outer Rashba bands with a different spin polarization in agreement with theoretical predictions, confirming a complex spin texture of bulk Rashba states. The outer band has about twice larger spin polarization than the inner one, giving evidence of a spin-orbit effect being related to the orbital composition of the band states. The switchable inner electric field of GeTe implies new functionalities for spintronic devices.
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