Silicon surface with giant spin-splitting

Details Silicon surface with giant spin-splitting Silicon surface with giant spin-splitting

2009-05-06

arxiv.org/abs/0905.0790v1

Phys. Rev. Lett. 103, 046803 (2009)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.103.046803

We demonstrate the induction of a giant Rashba-type spin-splitting on a semiconducting substrate by means of a Bi trimer adlayer on a Si(111) wafer. The in-plane inversion symmetry is broken so that the in-plane potential gradient induces a giant spin-splitting with a Rashba energy of about 140 meV, which is more than an order of magnitude larger than what has previously been reported for any semiconductor heterostructure. The separation of the electronic states is larger than their lifetime broadening, which has been directly observed with angular resolved photoemission spectroscopy. The experimental results are confirmed by relativistic first-principles calculations. We envision important implications for basic phenomena as well as for the semiconductor based technology.

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