  A search for the single material system that simultaneously exhibits
topological phase and intrinsic superconductivity has been largely limited,
although such a system is far more favorable especially for the quantum device
applications. Except artificially engineered topological superconductivity in
heterostructure systems, another alternative is to have superconductivity
arising from the topological materials by pressure or other clean technology.
Here, based on first-principles calculations, we first show that
quasi-one-dimensional compound (NbSe4)2I represents a rare example of a chiral
Weyl semimetal in which the set of symmetry-related Weyl points (WPs) exhibit
the same chiral charge at a certain energy. The net chiral charge (NCC) of the
below Fermi level EF (or a certain energy) can be tuned by pressure. In
addition, a partial disorder induced by pressure accompanied with
superconductivity emerges. Although amorphization of the iodine sub-lattice
under high pressure, the one-dimensional NbSe4 chains in (NbSe4)2I remain
intact and provide a superconducting channel in one dimension. Our combined
theoretical and experimental research provide critical insight into a new phase
of the one-dimensional system, in which distinctive phase transitions and
correlated topological states emerge upon compression.
