Ta₂NiSe₅ (Tantalum Nickel Selenide)

Ta₂NiSe₅ is a quasi-one-dimensional layered transition-metal chalcogenide and a narrow-gap semiconductor, and one of the most prominent excitonic insulator candidates. It undergoes a transition near 328 K accompanied by a structural distortion, with a low-temperature ground state believed to arise from spontaneous condensation of electron–hole excitons. This strongly correlated character, together with its quasi-1D anisotropy, makes Ta₂NiSe₅ a representative system for studying excitonic-insulator physics, band–exciton coupling, and ultrafast optoelectronics.

Sample specifications: Individual crystals measure approximately 6~8 mm, with a purity of up to 99.9999% (6N), and multiple high-quality single-crystal pieces included in each package.