Wang, Deyong, <span style="font-size: 14.6667px; text-align: center;">Department of Physics &amp; Nanotechnology, Aalborg University, Skjernvej 4A, 9220 Aalborg Øst, Denmark</span><div id="_mcePaste" class="mcePaste" style="position: absolute; left: -10000px; top: 0px, Denmark