Affiliation: | 1. Department of Physics, University of Durham, South Road, DH1 3LE, Durham, UK 2. Institute of Physics, Chinese Academy of Sciences, Beijing, PRC 3. Department of Applied Physics, University of Hull, Cottingham Road, HU6 7RX, Hull, UK 4. Department of Engineering Design and Manufacture, University of Hull, Cottingham Road, HU6 7RX, Hull, UK
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