Collaboration with Drexel University, USA

Our current collaboration in several areas of physics of novel electronic materials will further expand within the future. More specifically, layered TMDs exhibit rich physical properties. CDW and superconductivity coexist in most these quasi low dimensional materials such as 2H–TaSe₂, 2H–

NbSe₂, 2H–TaS₂, 4Hb–TaS₂, and 4Hb–TaSe₂. The CDW order originates from the instability of low dimensional electronic systems due to the nonzero electron-phonon coupling.

However, first studied over forty years ago, TMDs have regained widespread attention because of parallels between many of their properties and phenomena observed in high temperature superconducting copper-oxide and iron-arsenide materials.

Publications with Drexel Uni.: (1) Phys. Rev. B 91, 165109 (2015) and (2) Phys. Rev. B 91, 235113 (2015)

Collaboration with Moscow State University, Russia

The group of Prof. Alexander Vasiliev of Moscow state university in Russia and our research group at HPSTAR are in close collaboration. This cooperation has so far resulted in a number of high priority papers in leading physics journals and is expected to proceed.

Experiments at Wuhan National High Magnetic Field Center (HMFC):

In type-II singlet superconductors a magnetic field suppresses superconductivity for two reasons: (i) the phase of the Cooper pair wave function couples to the vector potential resulting in the appearance of vortices; and (ii) Zeeman coupling of the magnetic field to the electron spins polarizes and splits the conduction band, which destroys superconductivity when the loss in magnetic energy equals the energy gain from pair condensation.

Exploring the field dependence and the upper critical field are very important factors which help reveal the mechanism of the nature of superconductivity. Hc2 provides valuable information on the microscopic origin of pair breaking and reflects the electronic structure responsible for superconductivity Therefore; we have performed upper critical field measurements on various strangely correlated systems.

Using the Facility at HMFC, we explored various physical properties i.e. determination the Hc2, quantum critical point and the non-staturated magnetoresistance.