Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase

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Discovery of a Weyl fermion semimetal and topological Fermi arcs (2015, background): “Recently, it was understood that a Weyl fermion can emerge as a quasiparticle in certain crystals, Weyl fermion semimetals (1-22).”
Reciprocal skin effect and its realization in a topolectrical circuit (2019, methodology): “To conceptualize this, consider an analogy to the 2D Chern insulator and the 3D Weyl semimetal [42].”
Recent developments in transport phenomena in Weyl semimetals (2013, background): “Therefore, it is possible to fine tune Bi1−xSbx to the critical point separating the two phases (Fu and Kane [10], Murakami [25], Hsieh et al. [19]).”
Experimental discovery of Weyl semimetal TaAs (2015, background): “Separated Weyl nodes are topologically stable [19,20] because any perturbation respecting the translational symmetry can shift but not annihilate them [21,22].”
Weyl and Dirac semimetals in three-dimensional solids (2017, background): “Since the net topological charge enclosed within Brillouin is zero, this latter situation further requires the existence of two additional compensating partner Weyl nodes (Halász and Balents, 2012; Murakami, 2007).”