(Correspondent Junfeng Wang) Following the recent release of the "Physical Review Letters" and "Advanced Materials", the Wuhan National High Magnetic Field Center has made a number of research developments in the field of topology Dirac semi-metal, the results have been published recently in international publications such as Nature Communications and Physical Review X.
Topology Dirac semi-metal is a new topological quantum material whose body electrons form a three-dimensional Dirac cone structure, similar to "three-dimensional graphene". Under the action and driving of the high magnetic field, the topological Dirac semi-metal presents a series of novel quantum states and physical phenomena, such as fermions (also known as ghost particles), topological insulators, topological superconductors and so on. It is reported that this new material is very likely have important application prospects in the future of quantum computers and other fields. Therefore, the topology of Dirac semi-metal has become the hot spot of the field of physics in the international frontier in recent years.
Recently, the Jian Wang’s Research Group of Quantum Materials Center of Peking University cooperated with Junfeng Wang, a researcher at the Wuhan National High Magnetic Field Center, to delineate the full Fermi information of three-dimensional Dirac semi-metal Cd3As2 single crystals by means of an angle-dependent electrical transport experiment at low temperature and high magnetic field. The experimental results show that Cd3As2 has a single-cycle magnetoresistance SdH Quantum oscillation in the [112] and [44-1] crystal array directions, and a double-cycle SdH oscillation occurs in the [1-10] crystal array direction. The Further data analysis of rotating angle of magnetoresistance oscillations revealed that the Cd3As2 single crystal Fermi surface was composed of two nested ellipsoids. In addition, the quantum limit properties and Zeeman splitting behavior of Cd3As2 were observed in high magnetic field experiments up to 60 Tesla. Related work was published on September 16, 2015 in Physical Review X 5, 031037 (2015), the article displayed the 60 Tesla high magnetic field typical data as a " accompanying key image".
At the same time, the research group of Faxian Xiu, Department of Physics, Fudan University, cooperated with Professor Zhengcai Xia, work in the Wuhan National High Magnetic Field Center, systematically studied the Landau energy level splitting behavior of Cd3As2 single crystal under high magnetic field, and the evolutionary relationship between Berry phase and magnetic field angle. The results show that the symmetry breaking caused by the magnetic field plays an important role in the three-dimensional Dirac semi-metallic properties, and the experimental conditions of the high magnetic field have become an effective way to explore the Weyl fermion. The results of the collaboration were published in Nature Communications 6, 7779 (2015), entitled "Landau Level Splitting in Cd3As2 under High Magnetic Fields".
In addition, Professor Junfeng Wang, Professor Zhengcai Xia also with the research group of Shuang Jia, the Peking University Quantum Materials Center, and the research group of Tao Wu, a professor of University of Science and Technology of China, carried out fruitful cooperation, studied the TaAs, TaP, SmB6 Topology Dirac semi-metal by using high magnetic field experimental conditions, Preliminary studies were published in Physical Review B 92, 041203 (R) (2015) (Editor's Choice), Physical Review B 91, 205133 (2015), respectively.
The Wuhan National High Magnetic Field Center has carried out a large number of open operation work after the completion of the installation, has made a number of important scientific research results, and has published a number of high-level research papers, including Physical Review Letters, Nature, and research field covers the scientific frontier areas of condensed matter physics, materials physics, optoelectronics and microelectronics, biology, chemistry and so on. It has become a large public basic science research platform for domestic and foreign.
