We study a large variety of interesting materials including superconducting, magnetic, nano, and emergent topological quantum materials.
We start from single crystal synthesis, to structure phase determination, and to electronic transport, magnetic, and thermal properties characterizations, at our two labs and UA user facilities. For crystals grown in our lab, please see this page🔗. For lab equipment and facilities, please see this page🔗.
Quantum tunneling of relativistic fermions in the 0th Landau level in YbMnBi2 [Nature Communications 8, 646 (2017)]
The theory of topological phases and phase transitions, which is the subject of the 2016 Nobel Prize in Physics, has bridged particles in high energy physics and electronics in crystalline solids. Dirac, Weyl, and Majorana fermions have found counterparts in the emergent topological quantum materials including topological insulators/Dirac semimetals, Weyl semimetals, and topological superconductors, respectively. These emergent quantum materials, possessing linearly dispersed relativistic energy bands in momentum space protected by certain symmetries, have enormous potential to provide new insights into a range of physical properties displayed by electrons in crystals, offering the foundation for new generations of devices.
Our research on these materials mainly focuses on discovering new topological quantum materials, finding their exotic electronics properties owing to the non-trivial band topology, clarifying the interplay between topology, symmetry, magnetism, electronics correlations, etc. A few examples include the magnetic topological semimetal candidate NdSbTe, the lattice symmetry tuned topological phase in ZrSiS, etc. The material systems we have worked/been working on are shown on this page🔗, the relevant publications are shown here🔗.
Low Dimensional Materials
Nb3SiTe6, a material showing suppression of electron-phonon interaction with reducing size [Nature Physics 11, 471 (2015)].
Owing to quantum confinement effect on electrons, phonons, and magnetons, as well as enhanced surface-to-bulk ratio, materials in low dimensions exhibit drastically modified properties. Additionally, with reduced size, materials are more tunable by an external electric field, strain, etc. Furthermore, low dimensional materials also enable heterojunctions that display a wide spectrum of novel properties. Examples include the fantastic graphene, monolayers of transition metal dichalcogenide (TMD) semiconductors that possess direct bandgap and activated valley degree of freedom, and the recent breakthroughs in 2D magnets.
Our research on low dimensional materials focuses on novel properties in new or old low dimensional materials, obtained by mechanical exfoliations or CVD/PVD growth. The two emphases are topological materials in low dimensions, and the 2D magnet with high ordering temperatures. The material systems we have worked/been working on are shown on this page🔗, the relevant publications are shown here🔗.