WebJul 7, 2024 · We show that photoinduced excitations in Ta 2 NiSe 5 propagate coherently over distances up to 1 μm and with electron-like velocities, which we attribute to collective modes of the excitonic condensate and their hybridization with the lattice degrees of … WebAug 25, 2024 · Here we report the optical conductivity [s (w)] of Ta2NiSe5 measured at high pressures to 10 GPa and at low temperatures to 8 K. With cooling at ambient pressure, s (w) develops an energy gap of about 0.17 eV and a pronounced excitonic peak at 0.38 eV, as already reported in the literature.
Coherent order parameter oscillations in the ground state of the ...
WebTa₂NiS₅ crystallizes in the orthorhombic Cmcm space group. The structure is two-dimensional and consists of two Ta₂NiS₅ sheets oriented in the (0, 1, 0) direction. Ta⁴⁺ is … WebJul 16, 2024 · Here, we report the observation of incipient divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 using Raman spectroscopy. Critical fluctuations of the excitonic order parameter give rise to quasi-elastic scattering of B2g symmetry, whose intensity grows inversely with temperature toward the Weiss … purple flowering locust tree
mp-28308: Ta2NiS5 (Orthorhombic, Cmcm, 63)
WebTa2NiS5 is a narrow gap semiconductor (Eg~0.39 eV) with suspected exciton insulator behavior like observed in its sister compound Ta2NiSe5. Excitonic insulators are novel … WebTiSe₂ is trigonal omega structured and crystallizes in the trigonal P̅3m1 space group. The structure is two-dimensional and consists of one TiSe₂ sheet oriented in the (0, 0, 1) … WebFeb 16, 2024 · The crystal structure of Ta 2 NiSe 5 is shown in Fig. 1A.Above 327 K, Ta 2 NiSe 5 has an orthorhombic structure and belongs to the space group Cmcm with mirror symmetries normal to all three crystal axes preserved ().Below the transition temperature at T c = 327 K, the space group of Ta 2 NiSe 5 has been proposed to be C2/c, and it is a … purple flowering bush perennial