Peking University, Nov. 16, 2015: Most parent compounds of iron-based high temperature superconductors display a finite temperature “nematic” phase transition with spontaneous breaking of the 4-fold crystal rotation symmetry. This transition is usually accompanied by...

Peking University, Nov. 13, 2015: In the phase diagram of iron-based superconductors, superconductivity is commonly situated near the vanishing point of the phase boundary between tetragonal and orthorhombic crystal structures. This commonality has invoked major research efforts...

Peking University, Nov. 12, 2013: The discoveries of quantum Hall effect and topological insulators broaden the understanding of fundamental states of quantum matter. In topological view, the quantum matter can be divided into topological trivial and non-trivial materials. The th...

Peking University, Oct 28, 2015: More than 40 years ago, Robert B. Griffiths predicted that phase transitions can be dramatically changed by disorder effect and in particular the dynamical critical exponent can diverge. In the last 40 years, this theory has been applied to quantu...

Peking University, Oct. 21, 2015: Drug addiction has long been a bothersome problem. Scientists have developed cue-exposure therapies to suppress the patients’ desire to take drugs. The rational of the treatment is to link drug cues with an unfavorable experience, for examp...