Phys.org  April 2, 2024 Introducing electron correlations to a quantum spin Hall (QSH) insulator can lead to the emergence of a fractional topological insulator and other exotic time-reversal-symmetric topological order, not possible in quantum Hall and Chern insulator systems. An international team of researchers (USA – Boston College, Harvard University, UCLA, Texas A&M, University of Tennessee, MIT, Singapore, Japan, China, Canada) has found a new dual QSH insulator within the intrinsic monolayer crystal of TaIrTe4, arising from the interplay of its single-particle topology and density-tuned electron correlations. At charge neutrality, monolayer TaIrTe4 demonstrated the QSH insulator, manifesting enhanced nonlocal transport […]