Affiliation: | 1.Institute of Solid State Physics and Theoretical Optics, Friedrich-Schiller-Universit?t Jena, Max-Wien-Platz 1, 07743, Jena, Germany ;2.Institute of Theoretical Physics, Friedrich-Schiller-Universit?t Jena, Max-Wien-Platz 1, 07743, Jena, Germany ; |