Publications by authors named "Quanxin Hu"
Unconventional superconductivity is known for its intertwining with other correlated states, making exploration of the intertwined orders important for understanding its pairing mechanism. In particular, spin and nematic orders are widely observed in iron-based superconductors; however, the presence of charge order is uncommon. Using scanning tunnelling microscopy, and through expanding the phase diagram of iron-arsenide superconductor BaKFeAs to the hole-doping regime beyond KFeAs by surface doping, we demonstrate the formation of a charge density wave (CDW) on the arsenide surface of heavily hole-doped BaKFeAs.
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- Researchers are investigating materials that exhibit multiple symmetry breaking, which enables the formation of unique four-fermion states above superconducting critical temperatures.
- A recent study on BaKFeAs revealed a fermionic quadrupling condensate that disrupts Z time-reversal symmetry, highlighted by two specific heat anomalies.
- These anomalies indicate significant phase transitions: one shows a spontaneous Nernst effect at a higher temperature, while the other correlates with the transition to a superconducting zero-resistance state at a lower temperature.
Charge instability of topological Fermi arcs in chiral crystal CoSi.
Sci Bull (Beijing)
January 2023
Topological boundary states emerged at the spatial boundary between topological non-trivial and trivial phases, are usually gapless, or commonly referred as metallic states. For example, the surface state of a topological insulator is a gapless Dirac state. These metallic topological boundary states are typically well described by non-interacting fermions.
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