1. State Key Laboratory of Material Processing and Die & Mould TechnologySchool of Materials Science and EngineeringHuazhong University of Science and Technology Wuhan Hubei 430074 China
2. School of Physical Science and TechnologyInner Mongolia University Hohhot 010021 China
3. Department of Physics and AstronomyCalifornia State University Northridge Northridge CA 91330 USA
4. Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of Sciences Beijing 100190 China
5. Center for Functional NanomaterialsBrookhaven National Laboratory Upton NY 11973 USA
6. Department of Chemical EngineeringNational Taiwan University of Science and Technology Taipei 10607 Taiwan
7. School of Chemistry and Chemical EngineeringHuazhong University of Science and Technology Wuhan Hubei 430074 China