Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Spin-controlled Transport II

HL 26.3: Talk

Tuesday, March 23, 2010, 14:30–14:45, H14

Beating of Friedel oscillations induced by spin-orbit interaction — •Samvel M. Badalyan^1,2, Alex Matos-Abiague¹, Giovanni Vignale³, and Jaro Fabian¹ — ¹Department of Physics, University of Regensburg, 93040 Regensburg, Germany — ²Department of Radiophysics, Yerevan State University, 1 A. Manoukian Street, Yerevan, 375025 Armenia — ³Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA

By exploiting our recently derived exact formula for the Lindhard polarization function in the presence of Bychkov-Rashba (BR) and Dresselhaus (D) spin-orbit interaction (SOI), we show that the interplay of different SOI mechanisms induces highly anisotropic modifications of the static dielectric function. We find that under certain circumstances the polarization function exhibits doubly-singular behavior, which leads to an intriguing novel phenomenon, beating of Friedel oscillations. This effect is a general feature of systems with BR+D SOI and should be observed in structures with a sufficiently strong SOI.

The work is supported by the EU Grant PIIF-GA-2009-235394 (SMB), SFB Grant No. 689, and NSF Grant No. DMR-0705460 (GV).