PAN 232 (office)
kang @ physics.umn.edu
My research interest is in understanding various quantum materials and their attractive properties, particularly superconductivity, nematicity and magnetism. A low temperatures, such materials can display a variety of "emergent" phenomena resulted from strong correlation effects -- cooperative behavior that cannot be predicted based on the properties of individual electrons. By applying various analytical and numerical techniques, my research focus on the understanding and manipulation of the properties of these materials.
One of my long-standing research topics is the properties of iron-bases superconductors (FeSC), which was discovered about ten years ago. The most intriguing part of this material is the correlation effects, and makes it an outstanding example of quantum materials. Electrons in FeSC system are highly correlated and organize themselves into the electronic nematic phase -- a quantum version of anisotropic liquid crystal, with only rotation symmetry broken. This phase was proposed about decades ago, but was observed only recently in FeSC and several other systems. Therefore, FeSC provides a platform for researchers to study and manipulate the properties of nematic phase. Since the beginning of my graduate study when the material was just discovered, I have focused on the nematic phase, especially the interplay between nematicity and other interesting phenomena, such as superconductivity, magnetism, disorder, etc. My projects are aimed at a coherent understanding of the nematic phase by both constructing models specific to materials and developing theories in a general perspective.
Not only focusing on theories, but I also closely cooperated with experimentalists to explain the experimental data. These experiments include the penetration depth, the neutron scattering, the transport properties, various phase diagrams, etc. I believe such cooperation, especially in my research field, provides a perfect opportunity for theorists to construct a solid model for understanding exotic properties of quantum materials.
Jian Kang and Rafael M. Fernandes, Phenomenological theory of the superconducting state inside the hidden-order phase of URu2Si2, Phys. Rev. B 92, 054504 (2015)
M. H. Christensen, Jian Kang, B. M. Andersen, I. Eremin, R. M. Fernandes, Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides, arXiv:1508.01763
Jian Kang and Jiadong Zang, Transport Theory of Metallic B20 Helimagnets, Phys. Rev. B 91, 134401
Jian Kang, Xiaoyu Wang, A.V. Chubukov, and R.M. Fernandes, Interplay between tetragonal magnetic order, stripe magnetism, and superconductivity in iron-based materials, Phys. Rev. B 91, 121104(R)
Xiaoyu Wang, Jian Kang, and Rafael M Fernandes, Magnetic order without tetragonal symmetry-breaking in iron arsenides: microscopic mechanism and spin-wave spectrum, Phys. Rev. B 91, 024401 (2015)
Jian Kang, Alexander F Kemper, and Rafael M Fernandes, Manipulation of gap nodes by uniaxial strain in iron-based superconductors, Physical review letters 113, 217001(2014)
Jian Kang and Zlatko Tešanović, Dimer impurity scattering, reconstructed Fermi-surface nesting, and density-wave diagnostics in iron pnictides, Physical Review B 85, 220507(2012)
Vivek Thampy, Jian Kang, JA Rodriguez-Rivera, Wei Bao, Andrei T Savici, Jin Hu, TJ Liu, Bin Qian, David Fobes, ZQ Mao, CB Fu, WC Chen, Qiang Ye, RW Erwin, TR Gentile, Zlatko Tesanovic, and C Broholm, Friedel-Like Oscillations from Interstitial Iron in Superconducting Fe 1+y Te0.62 Se0.38, Physical review letters 108, 107002(2012)
Jian Kang and Zlatko Tešanović, Theory of the valley-density wave and hidden order in iron pnictides, Physical Review B 83, 020505(2011)