Affiliation: | 1. Theoretische Physik I, Universit?t Bayreuth, 95440, Bayreuth, Germany 2. Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, 60439, USA 3. Engineering Sciences and Applied Mathematics, Northwestern University, 2145 Sheridan Road, Evanston, IL, 60202, USA
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