Spin-photocurrent in p-SiGe quantum wells under terahertz laser irradiation

V. V. Bel'kov; S. D. Ganichev; Petra Schneider; D. Schowalter; U. Roessler; W. Prettl; E. L. Ivchenko; R. Neumann; K. Brunner; G. Abstreiter

arXiv · cond-mat/0301389

Spin-photocurrent in p-SiGe quantum wells under terahertz laser irradiation

V. V. Bel'kov·S. D. Ganichev·Petra Schneider·D. Schowalter·U. Roessler·W. Prettl·E. L. Ivchenko·R. Neumann·K. Brunner·G. Abstreiter

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Abstract

A detailed study of the circular photogalvanic effect (CPGE) in SiGe structures is presented. It is shown that the CPGE becomes possible due to the built-in asymmetry of quantum wells (QWs) in compositionally stepped samples and in asymmetrically doped structures. The photocurrent arises due to optical spin orientation of free carriers in QWs with spin splitting in k-space. It is shown that the effect can be applied to probe the macroscopic in-plane symmetry of low dimensional structures and allowing to conclude on Rashba or Dresselhaus terms in the Hamiltonian.

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V. V. Bel'kov, S. D. Ganichev, Petra Schneider, D. Schowalter, U. Roessler, W. Prettl, E. L. Ivchenko, R. Neumann, K. Brunner, G. Abstreiter. 2003-01-21. Spin-photocurrent in p-SiGe quantum wells under terahertz laser irradiation. https://arxiv.org/abs/cond-mat/0301389

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